A bow square is the cheapest tool in archery and the only tuning variable you can verify in ten seconds flat. It tells you the brace height of your bow, the distance from the deepest point of the grip to the bowstring, and it sets your nocking point in the same motion. Get that number wrong and every sight mark you have ever set becomes suspect.
The strange part about the best bow squares for tuning is how few decisions are actually involved. Ten tools are on the market, most of them cost about the same as a box of arrows, and the differences between them come down to shape, scale readability and machining. That makes it easy to overthink and easy to get wrong, particularly if you buy on looks instead of on how the tool sits against your riser.
There is also a fair challenge to the whole category. A long-running ArcheryTalk thread has archers who have used RS sight and level systems for a decade or more and who concede that a square mainly gets your nocking point set. That is not wrong, and we will address it directly further down. What an RS level does not do is give you the absolute string-to-grip measurement in inches, which is what you need when a new string beds in and everything feels different.
We compared all ten squares across material, scale layout, clip design and what happens when you actually try to set brace height on a strung bow. Here is what we found, including the two that disappointed us.
Table of Contents
What Is a Bow Square and What Does It Actually Measure?
A bow square is a small T-shaped measuring tool, usually aluminium or plastic, that hooks into the riser pivot point to read brace height, the distance from the deepest part of the grip to the string, and to locate the nocking point on the bowstring. It does not measure axle-to-axle, draw weight or arrow spine.
The geometry is simple. The short arm hooks into the pivot point of the riser, which is a fixed reference machined into every bow at a consistent angle. The long arm then hangs down perpendicular to the string and carries a graduated scale, so where the string crosses the arm is your reading.
Brace height matters because it sets string tension, and string tension drives arrow speed, arrow flight and where your group lands. Your sight is calibrated to one specific brace height, so when the number drifts, every mark you shot is now slightly wrong. That is why the tool matters even for archers who own an RS system.
One clarification before we get into the list. A bow square does not tell you arrow spine, draw length or dynamic draw weight, and it cannot diagnose whether your bow needs new strings. It tells you one distance, accurately, every time you use it properly. The rest of this guide covers the shapes, the mistakes that produce wrong readings, and the workflow that follows the measurement.
Top 3 Best Bow Squares for Tuning (October 2026)
These three cover the realistic use cases: a full kit for a first bow, a bare square for accuracy, and a value bundle that still includes pliers and nocks.
Zonon T-Square and Nock Kit
- Aluminium and nylon body with laser-etched inch and centimetre markings
- Plier plus six brass nocking points in one package
- Clips hold string position firmly
Easton T-Bow Square
- Aluminium construction at just 22.68 g
- Imperial one side and metric the other
- Centered zero on the nocking point scale
AHOSOUTLY T-Square Kit
- Epoxy-coated aluminium square resists scratches
- Stainless steel spring plier plus eight nocks
- Measures nock height and brace height
Best Bow Squares for Tuning in 2026
Every square below clips to the string or hooks the pivot point. Weight and body material come from the manufacturer data, and the rating column is the current average from buyer reviews.
| Product | Specifications | Action |
|---|---|---|
| Zonon T-Square and Nock Kit |
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Check Latest Price |
| Easton T-Bow Square |
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 KESHES T-Square, Pliers and Nocks |
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 Easton L Bow Square |
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| AHOSOUTLY T-Square Kit |
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 SOPOGER T-Square and Nock Sets |
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 NIKA ARCHERY T-Square and Pliers |
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Check Latest Price |
 SOPOGER Single T Bow Square |
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Check Latest Price |
 DEERACE T-Square and Plier Set |
|
Check Latest Price |
 Swpeet 17-Piece String Tools Kit |
|
Check Latest Price |
1. Zonon T-Square and Nocking Point Kit – Best Overall
Zonon Bow String Nocking Points Pliers Set, T Shape Square Ruler, Dark Blue
Aluminium and nylon body
Laser-etched inch and centimetre markings
Pliers plus six brass nocks
4.64 oz
Pros
- Laser-etched markings that will not wear off
- Clips grip the bowstring firmly and hold position
- Plier and six brass nocks included in one kit
- Light enough for a quiver pouch
- Metal build that compares well to costlier tools
Cons
- Plier hinge is creaky and can stick during use
- Scale reads from the end of the ruler rather than the clips
- Some edges are sharp and need care
This is the kit we hand to a first bow owner without hesitating. It gives you the T-square, a spring-loaded nocking plier and six brass nocking points in a single package, which means the measuring tool and the parts you install with it arrive together. That is the whole first bow setup in one box.
The square itself is an aluminium and nylon body measuring 12.99 inches long by 4.33 inches wide, weighing 4.64 ounces. The markings are laser etched rather than printed, and they cover both inch and centimetre scales, which matters more than it sounds because printed scales on cheap tools fade within a season.
In use, the clips hold the bowstring firmly and the reading stayed consistent across repeated measurements on the same bow. The anti-skid nylon inner layer protects the serving from the clip jaws, which is a small detail that adds up over years of nock changes.
The honest weakness is the scale origin. It reads from the end of the ruler rather than from the clip face, which confuses first-time users more than any other issue we found in testing. The plier is also creaky and can stick when crimping a nock shut.
Why we rate it the best overall
Almost 3,000 reviews at a 4.6 average is the largest sample in this category, and the praise is consistent rather than scattered. Buyers single out the etched markings and the clip grip, and several verified squareness against a string level after seating the tool correctly.
That verification habit is the reason this kit wins. A square that reads true when you check it is worth more than a cheaper square that reads consistently wrong, and this is the tool we would trust for a recurve, a compound or a longbow.
Where it falls short
Buy this if you are stringing a bow for the first time and need nocks as well as a measuring tool. Skip it if you already own a set of nocking points and a crimper, because the square is the only part you would actually be adding.
The sharp edges are worth a mention. Nothing here is dangerous, but treat it as a tool rather than a pocket item, and keep it out of a quiver where it can rub against arrow fletching.
2. Easton T-Bow Square – Best Square Accuracy
Easton T-Bow Square Archery Bow Tuning Tool
Aluminium construction
Imperial one side and metric the other
Centered zero for nocking point
22.68 g
Pros
- Perfectly square 90 degree reference confirmed by reviewers
- Laser-etched increments that stay readable
- Clips hold the string tightly without slipping
- Centered zero speeds up nocking point setup
- Lightweight aluminium from an established archery brand
Cons
- Clips are stiff on first use
- Clip arrangement suits bows without heavy center serving
If you want one square and nothing else, this is it. The Easton T-Bow Square is a bare aluminium tool with no plier, no nocks and no case, and every one of those omissions is a decision in your favour. At 22.68 grams it disappears in a pocket or a bow case.
The measurement reference is the reason it sits this high. Reviewers repeatedly describe confirming a true 90 degree angle against another reference, and 80 percent of reviews are five star. The scale is laser etched with imperial on one face and metric on the other, so a dual-scale archer never has to convert a figure by eye at full draw.
The centered zero on the nocking point scale is the feature most first-time buyers mention. Rather than working out where the string should sit relative to the clip, you align the nock with the middle of the scale and clamp. It turns a judgement call into a repeatable one.
Two complaints recur. The clips are stiff the first time you snap them onto a string, and most reviewers solve that by flexing the clips slightly before use. Separately, the clip arrangement works best on bows without heavy center serving, which limits it slightly on some compound configurations.
Why accuracy matters more than features
A bow square is a measuring instrument, so straightness and squareness are the only features that really count. A TradTalk thread titled My Bow Square Blows captures the failure mode exactly: an off-reading square reports a confident wrong number and the archer has no way to know. A machined aluminium tool from an established brand is the cheapest insurance against that.
Easton aluminium is also the recommendation that surfaces repeatedly in beginner archery forums, and the brand carries a one year warranty on this model.
Where it falls short
Choose this square if you already own nocking points and a crimper, and you shoot either recurve or compound. It is a measuring tool, so it will not help you install anything.
If you are building a kit from nothing, the extra cost of the Zonon kit buys you a plier and six nocks for very little money. For a pure accuracy purchase, though, nothing in this category beat it.
3. KESHES T-Square, Pliers and Six Brass Nocks – Best Refill Kit
KESHES Archery Bow String Nocking Points Set – T Square Ruler, Nock Pliers with 6 Brass Nocks for Recurve Bow – Ideal for Bow and Arrow Tuning & Archery Target Accessories
Stainless steel pliers
Brass nocks with nylon inner layer
Dual scale T-square
13.5 by 5.39 inches
Pros
- Complete set with T-square
- plier and six brass nocks
- Nylon-lined nocks grip the string without slipping
- Works for recurve
- traditional and longbow setups
- Easy for a beginner to use
Cons
- Ruler graduations sit at odd intervals
- Plier jaws are small and need pre-pressing
- Build quality varies between examples
This kit sits in the middle of the range and does the two jobs you need most often. You get a T-square, a nocking plier and six brass nocks, with a stainless steel plier and a nylon-lined nock that resists sliding on the string after installation.
The package measures 13.5 by 5.39 by 0.75 inches and weighs 0.19 kg, so it is the same footprint as the other kits here without the extra string care items. It carries a one year manufacturer warranty and is listed for recurve, traditional and longbow use.
Our main reservation is the ruler layout. The graduations are placed at intervals that do not follow the usual pattern, so reading the scale takes a moment longer than it should. Several buyers describe the same thing, and a minority found the plier jaws too small for confident crimping without pre-pressing the nock closed.
Consistency between examples is the other watch item. Reports of build quality varying from one kit to the next are common enough that we would check the plier and nocks before the first install.
Who this suits
Traditional and longbow archers who replace nocking points regularly will get the most from this kit, because the brass nocks with nylon liners are the consumable part and six of them is a sensible first stock. Recurve shooters setting a new bow get the same benefit.
It also works well as a second square. One in the bow case for field checks and one on the bench at home means you stop borrowing tools before a hunt.
Who should pass
Pass if you want the cleanest possible scale reading. The Easton T-Bow Square has a more conventional and more legible layout, and you are paying for machining quality here rather than kit contents.
Pass if crimping nocks is something you do often. Dedicated nock-specific pliers, like the ones on the DEERACE set, produce a more consistent crimp than general-purpose pliers.
4. Easton L Bow Square – Best for Recurve and Longbow
Easton L Bow Square Aluminum Bow Measuring Tool with Laser Etched Rule
Aluminium construction
Precision laser etched scale
Extended L-shaped arm
22.68 g
Pros
- Sturdy and straight with an easy to read scale
- Strong clips that attach to the string cleanly
- Extended arm makes nocking point placement easier
- Handy for brace
- tiller and nock position work
Cons
- L-shape is awkward on compound bows without center serving
- T-shape suits compound bows better
The shape is the whole argument here. The extended arm of an L-square reaches further across the string, which makes it noticeably easier to set a nocking point accurately on a longbow or a traditional recurve where the string sits further from the riser edge. On a compound, the same reach becomes a liability.
The construction matches the Easton T-square in the essentials: aluminium body, 22.68 grams, precision laser etched scale and a one year warranty. Reviewers highlight durability, contrast coloured numbers and easy handling, and 82 percent of reviews are five star.
In practice the extended arm made nocking point placement faster than a smaller square, and the same scale works for brace height, tiller checks and nock position work. For a traditional shooter who re-strings and re-crimps often, that versatility is worth having.
Why recurve and longbow shooters choose this
On a traditional bow the nocking point position has more effect on how the bow feels and how the arrow leaves than on a compound, because the string is doing more of the work. A longer reference arm gives you a clearer line of sight to the scale while you watch the nock, and that matters more than most buyers expect.
Traditional archers on TradTalk also use a bow square to run the World Archery Tuning for Tens method, stepping brace height in tenths rather than chasing one figure. An L-square gives an easy, repeatable reference for that.
Where it falls short
Pass if you shoot a compound with a thin or unserved string section. The L-format needs more center serving to grip properly, and several reviewers note it is awkward there. The T-shape is simply the better fit for that bow.
Pass if portability is the priority. At 22.68 grams it is light, but the longer arm sits less comfortably in a small bow case than a compact T-shape.
5. AHOSOUTLY T-Square Kit – Best Value
AHOSOUTLY Archery Bow String Nocking Points Set with T Square Ruler Nocking Buckle Pliers and 8pcs Nocking Buckle Set,for Recurve and Compound Bowstring Accessories…
Epoxy-coated aluminium square
Stainless steel spring plier
Eight brass nocks
Dual inch and millimetre scale
Pros
- Strong value with square
- plier and eight nocks included
- Clips held up through repeated use without visible wear
- Epoxy coating resists scratches
- Accurate when oriented for nock or brace height
Cons
- No printed instructions included
- Tool must be turned for nock height or brace height
This is the kit we would buy with our own money if we were starting from zero. You get a T-square, a stainless steel spring-design crimping plier and eight brass nocking points with anti-slip nylon liners, which is more nocks than most kits at this level include.
The square is an aluminium alloy body with an epoxy paint finish, and that finish is the reason it holds up. Buyers report the coating resists scratching after extended use, and the clips showed no visible wear across repeated clamping. The package is 13.5 by 4.8 by 1.26 inches at 0.13 kg, with a one year warranty.
The measurement carries both inch and millimetre scales. Accuracy was consistent once the tool was oriented correctly, and the spring plier jaw opened smoothly enough that the crimp came out even on the first attempt.
Two issues, both fixable. There are no printed instructions, so a first-time user has to work out the correct orientation. And that orientation matters: the tool is turned one way for nock height and another for brace height, which is exactly the mistake that produces a wrong reading.
Where the value actually comes from
Eight nocks instead of six, a spring-action plier and a coated square body is a genuinely complete setup for a compound or recurve first string. Buyers consistently rated it as strong value, and the clip durability held up over long use rather than just the first few crimps.
If you want a second setup square for a second bow, this is also the cheapest way to have one on the bench and one in the case.
Where it falls short
Pass if you value the cleanest possible reference accuracy. The epoxy finish and spring plier are practical choices, not precision choices, and a bare machined square like the Easton T-Bow Square reads truer in the long run.
Pass if you will be crimping many nocks. Dedicated nock-specific pliers produce a more even crimp with less practice.
6. SOPOGER T-Square, Pliers and Six Nock Sets – Best for First Bow Setup
SOPOGER Archery Bow Square Nocking Points Pliers Bow String Knock Kit T Shape Turning Bow Square Ruler Tool String-Loop Nocking Buckle Pliers for Recurve Compound Bow Accessories (Red)
Alloy square body
Square arm measures 13 inches
Coated handles
0.13 kg package
Pros
- Small and light enough for a quiver pouch
- Handled a full nock install cleanly on a first recurve setup
- Coated handles are comfortable to grip
- Good combined square
- plier and nock value
Cons
- Graduations run in a confusing nonstandard order
- Crimper is a basic single-slot design
- Plier jaws feel clumsy and need a steady hand
Compact is the word for this one. The square arm measures 13 by 3.8 by 0.39 inches and the plier 4.3 by 2.2 by 0.6 inches, so the whole kit fits in a quiver pouch or the side pocket of a bow case. For a first recurve setup, everything needed for the string work fits in one place.
You get one nocking buckle plier, six bowstring nock sets with anti-skid nylon inner layers, and the T-square itself. Coated handles made the crimping more comfortable than the bare metal tools we have used, and the nock install came out clean.
The recurring criticism is the ruler layout. Graduations are laid out in a reversed, nonstandard order that makes the scale harder to read than it should be, and that is a genuine problem on a tool whose whole job is reading a number accurately. The crimper is also a basic single-slot design rather than a heavy-duty one.
The short string-facing arm of the square is the third note. It works, but it gives you less room to align a nock than the longer arms on the competing kits.
Why it suits a new archer
Everything a beginner needs for a first string install is in the pouch, at a low enough weight that it stays in the field bag. Owners who bought it for a first bow setup reported that the kit did what it promised without any learning curve beyond the scale layout.
It also works as a portable check tool. Traditional field shooters who confirm brace height after unstrapping in camp find the size more useful than a longer L-shape.
Where it falls short
Pass if reading the scale quickly matters. The graduations are the weak point and no amount of practice fully fixes an unusual layout.
Pass if you crimp nocks constantly. The single-slot crimper and clumsy jaws are better suited to occasional changes than to a busy workshop.
7. NIKA ARCHERY Nock Pliers and T-Square – Most Versatile
NIKA ARCHERY Nock Pliers Set and Bow T Square Ruler Tools
Anodized aluminium square
Titanium steel plier
4 nock sets included
6.4 oz package
Pros
- Square is the strongest part of the set with tight clips and no play
- Stamped anodized aluminium body is sturdy yet lightweight
- Pliers are decently machined and generally hold up
- Compact enough for a hunting bag
Cons
- Pliers can break during first use
- Nocking points included are poor quality with burrs
- Gauge lines lack colored markings and are hard to see in low light
This is an anodized aluminium square with a titanium steel plier and four nock sets in a 6.4 ounce package, and it is worth judging the two halves separately. The square is excellent. The plier is not always.
The square clips on tight with no play at the contact point, which is the property that separates a good square from a bad one, and the stamped markings sit clearly on the anodized body. Owners consistently single the square out as the strongest part of the set.
The problems are all in the accessories. Reports of plier breakage during first use or after only a couple of operations appear repeatedly, and the included nocking points are described as poor quality with burrs that several buyers stopped using. The gauge lines also lack coloured markings, which makes them hard to read in low light.
The 4.4 average reflects that split exactly. Sixty-three percent of reviews are five star, and the negative comments cluster around the plier rather than the square.
Why the square itself is worth it
If you already have a crimper and nocks, this is a strong square purchase. The anodized finish resists wear, the clip tension is firm without being aggressive on the serving, and the package is small enough for a hunting bag.
Because the square is the durable part and the plier is the disposable part, buying this and keeping your existing crimper is a sensible combination for many archers.
Where it falls short
Pass if you need a complete kit from one purchase. Paying for accessories you may not use is harder to justify here than with kits whose pliers hold up.
Pass if you shoot in dim conditions. Uncoloured gauge lines are a real limitation for early morning or indoor range work.
8. SOPOGER Single T Bow Square – Best Budget Square
SOPOGER Archery Bow Square T Shape Bow Square Ruler Bowstring Measurement Tool Bow Turning Kit for Recurve Bow and Compound Bow Accessories (Red)
Aluminium alloy body only
Graduations engraved not painted
Corrosion-resistant finish
Single square, no accessories
Pros
- Graduations engraved into the metal rather than painted on
- Clips grip the string with the right amount of tension
- Simple and accurate for brace
- tiller and nock work
- Metal body fits inside a quiver and represents strong value
Cons
- Thin soft alloy can bend or twist
- Some units arrive bent out of shape
- Not durable enough for heavy workshop use
This is a single aluminium alloy T-square with nothing else in the box, and it is the cheapest way to get an accurate measuring reference in this roundup. No plier, no nocks, no case, which is exactly what a shooter who already owns those needs.
The detail that matters most here is that the graduations are engraved into the metal rather than painted on. That is a meaningful upgrade over the printed scales on many tools at this level, and it is why the markings stayed legible through our checks.
Clip tension was right in the middle of the useful range. Firm enough to hold position, gentle enough not to mark the serving, and the corrosion-resistant finish handled a damp bow case without complaint.
The weakness is the gauge of the metal. The alloy is thin and soft enough to bend or twist under modest force, and a recurring complaint is copies arriving already bent. Treat it as a portable check tool rather than a bench instrument, and check squareness the day it arrives.
The nine percent one-star share is the highest in this roundup and comes almost entirely from bend-related complaints. A bent square reads wrong and gives you no warning, which is the exact failure described in the accuracy complaints on archery forums.
When a budget square makes sense
A square is a consumable in practice. Archery forums note that once an archer owns a decent one, repurchases are rare, which makes a low-cost first tool a sensible place to start. If it bends in a bow case after a season, you have lost very little.
It is also the right choice for a field kit, a second bow, or anyone who wants an accurate reading without carrying a plier and a bag of nocks.
When to spend more
Spend more if the square will live on a workbench or in the hands of a bowyer. Aluminium of this thickness does not tolerate being leaned on or dropped in a drawer.
Also spend more if you will be the one explaining brace height to a beginner. A stiffer, better-supported square reduces the chance of teaching someone a wrong reading.
9. DEERACE T-Square and Plier Set – Best for Custom Crimping
DEERACE Bow String Nocking Points Set – T Square Ruler with Plier for Recurve and Compound Bowstring Accessories (B Set, Red)
Aluminium square with inch and centimetre markings
Spring-loaded archery plier
Six nocks with rolled outer edge
0.21 kg package
Pros
- T-square makes setting brace height much easier than a tape measure
- Nock-specific pliers give a more consistent crimp than flat-faced pliers
- Spring stays in place through repeated use
- Dual markings plus calibrating adjustments for sight alignment
Cons
- No printed instructions for nock placement
- Nocking points are hard to clamp evenly at first
- One buyer received a box missing nocks and arrow rest
The differentiator in this kit is the plier. It is a purpose-built archery crimper with covered handles rather than general-purpose pliers adapted for the job, and that produces a noticeably more consistent crimp once you find the right tension.
The square is an aluminium T-shape with both inch and centimetre markings, and it made setting brace height noticeably easier than working from a tape measure. The calibrating adjustments are a useful extra for sight alignment, and the package is 13.07 by 5.04 by 0.75 inches at 0.21 kg.
The six nocks have an anti-skid nylon inner layer and a rolled outer edge, and the rolled edge is the detail that protects the bowstring from wear as the nock sits on it.
Two practical issues. There are no printed instructions explaining nock placement for different shooting styles, so you will be researching that yourself. And the crimp tension takes trial and error to dial in, with the nocks needing practice to clamp evenly.
The review count is the smallest in this roundup, so treat the pattern as directional rather than settled. One buyer also received a box missing the nocks and an arrow rest.
Who benefits from the crimper
If you move your nocking points often, a dedicated crimper pays for itself in consistency rather than speed. An even crimp means the nock seats the same way every shot, which is the foundation of a repeatable nocking point and a repeatable sight picture.
Archers who set up multiple bows, or who tune a longbow at different draw weights, will use this plier far more than a single-square buyer will.
Where it falls short
Pass if you want the strongest possible endorsement. A smaller review base means less long-term evidence about how the square holds up over years of use.
Pass if crimping is not part of your routine. Paying for specialist pliers you will use twice a year is harder to justify than buying the square alone.
10. Swpeet 17-Piece Bow String Tools Kit – Best All-in-One String Care Kit
Swpeet 17Pcs Archery Bow String Tools Kit, Archery Nocking Buckle Plier, Bowstring Nock Sets Archery, T Shape Bow Square Ruler, Bow String Wax, Archery String Silencer, Bowstring Finger Protector
17-piece string care set
T-square marked for nock point and brace height
Crimping plier, wax, silencers and finger savers
0.19 kg package
Pros
- Bundles square
- crimper
- six nock sets
- wax
- silencers and finger savers in one kit
- Square marked for both nocking point and brace height
- Crimper installs nocks on a strung bow without damaging the string
- Finger savers soften the draw and reduce glove reliance
Cons
- No instructions included so setup must be researched
- Silencer fur strands are long and need trimming
- Installing finger savers over string loops is fiddly
This is not a bow square roundup entry in the usual sense. It is a full string care package with a square inside it, and for anyone building a first kit from nothing it covers more ground than any other single purchase in this list.
The seventeen pieces cover a crimping plier for brass split-ring nocking points, six nock sets, the T-shape square, string wax, rabbit hair string silencers and silicone finger savers installed with the included needle tool. The square is marked for both nocking point and brace height, so it does the two jobs every square here does.
The crimper is the useful surprise. It installs nocking points while the bow is strung without pinching or damaging the string, which is the step most beginners find fiddly when the string is off the bow.
The square and crimper are described as functional rather than exceptional, which fits a kit this broad. The silencers damp string vibration, the wax adds a protective layer against UV and moisture, and the finger savers soften the draw enough to reduce how much you rely on a shooting glove.
The most common complaint across every kit in this roundup appears here too: no instructions, so setup has to be worked out online. The silencer fur strands also run long and need trimming, and fitting the finger savers over the string loops is fiddly work.
Who should buy the full kit
Anyone who has just bought their first bow and owns nothing else. Wax, silencers and finger savers are consumables you would buy eventually anyway, and pulling them from the same kit saves a second order.
String silencers are also the fix for a dull, ringing release sound, which is one of the symptoms of a setup that needs attention.
Who should buy just a square
Pass if you already own string care supplies. This package is deliberately broad, so you would be paying for items that sit unused in a drawer.
Pass if accuracy is your priority. A bare aluminium square with a conventional scale will serve you better than the one bundled inside a seventeen piece kit.
How to Use a Bow Square to Set Brace Height Correctly
Most wrong readings come from one mistake, and it is not using a poor square. It is tilting the tool. The reading is only valid when the long arm sits perpendicular to the string.
Unload the limbs first. Loosen the tension on both limbs before handling the riser so nothing shifts while you work.
Hook the short arm into the riser pivot point. This is the machined reference angle, and it is what makes the measurement repeatable instead of guesswork.
Let the long arm hang straight down. Do not rotate the square toward or away from the string to line it up with something. A tilt throws the reading off silently, which is the single most common error we see described by archers.
Read where the string crosses the scale. The measurement runs from the deepest point of the grip to the string, not from the edge of the riser.
Compare against the manufacturer figure. Most compound bows sit around 7.5 inches, or 19 cm. Many recurves run 8 to 9 inches, or 20 to 23 cm, and traditional bows often sit lower still.
Adjust through the string, not the riser. Turn the string in both directions equally to shorten or lengthen the measured distance, then re-measure.
Metric shooters get the same procedure with the centimetre face. Most dual-scale squares in this roundup carry inch on one side and centimetre on the other, so the conversion is handled by turning the tool rather than by mental arithmetic.
After the first hundred shots with a new string, measure again. New Dacron and modern synthetic strings bed in, and brace height drops slightly as they stretch, which is a change of setup rather than a fault.
How to Set Your Nocking Point with a T-Square
Sequencing is a genuine argument in the archery community. Recurve archers generally advise setting brace height first, while coaches often recommend leaving brace height at the manufacturer figure until the shooter is consistent. Our view is that you set the nocking point after brace height, because the nocking point position changes how the string feels at brace.
Confirm brace height first. Measure and adjust until the number matches the specification for your bow.
Fit the square to the string. Clip the square on so the long arm runs along the string, with the clip face positioned where you want the nock to sit.
Use the centered zero. A square with a centered zero on the nocking point scale lets you align the nock with the middle mark rather than estimating an offset.
Crimp the nock. Squeeze the nocking point with the plier only until it holds. Over-crimping flattens the nock and can damage both nock and string.
Check the serve. The nock should sit on flush serving and cannot be rotated by hand. If it turns, the crimp is not finished.
Compounds use a side-mounted nocking point that indexes against the string, and recurves and traditional bows use a hole-on-string nock. The measurement method is identical; only the hardware differs. A kisser button is a separate part entirely and does not replace the nocking point.
T-Square vs L-Square vs Single-Arm: Which Form Factor Do You Need?
The form factor matters more than most buyers expect, because it decides which bows the tool will grip properly.
T-square clips above and below the nocking point, so it grips the string from both sides and works on unserved or lightly served strings. This is the most versatile shape and the right default for compound bows, where the string section is often thin.
L-square uses a single clip with a longer arm. The extra reach makes nocking point placement easier on longbows and traditional recurves where the string sits further from the riser, but it needs more center serving on a compound to grip properly.
Single-arm squares are the simplest and lightest, and they suit a shooter who only ever checks brace height and already has another tool for crimping. Their limitation is that positioning the nocking point is slower, because there is no second clip to hold the string.
Folding and compact kits trade a little rigidity for packability. If your square lives in a field bag rather than a bench, a compact body matters more than a long arm.
Across this roundup, nine of the ten tools are T-shaped and one is L-shaped, which tells you where the format is heading. If you shoot one compound and one traditional bow, a T-square is the compromise that serves both.
How to Tell If Your Bow Square Is Reading True
A square that reads wrong is worse than no square, because it produces a confident number you trust. Two checks catch almost every bad tool.
Check it against a known straight edge. Lay the long arm flat on a machined surface or a table edge and press the corners with a thin sheet of paper. If the paper drags in one spot, the arm is not straight.
Check squareness. Press the short arm against a wall and see whether the long arm sits at a clean 90 degrees. The corner should sit flush without a wedge of daylight.
There is also a check that needs no reference tool at all. Cut a strip of mailing label, mark the target brace height on it, and slide the strip against the string. If the string sits between the two pencil marks every time, your reading is repeatable, and repeatable is what actually matters.
That last point reframes the goal. You are not chasing a perfect number, you are chasing a number that does not change between visits to the range. A square that reads 7.4 inches the same way for a year is doing its job.
What to Look For When Buying a Bow Square
Material and finish. Aluminium beats plastic for accuracy and for staying square over time. Within aluminium, anodized or laser etched markings outlive anything painted on. Plastic is fine for a child learning stringing, and wrong for anyone tuning a bow they care about.
Scale units. Dual inch and centimetre scales are worth having even if you shoot imperial, because they cost almost nothing extra and make a tool easy to pass on or sell. Watch out for graduations laid out at unusual intervals, which were the most common complaint in this roundup.
Where the scale starts. Some squares read from the end of the ruler rather than from the clip face. Both work, but the two produce different numbers on the same bow if you mix tools, so pick one convention and stay with it.
Clip quality. Clips should hold the string without marking the serving and without slipping when you take your hand off. Firm on the first snap is normal; flexing the clips slightly before use is the standard fix.
Kit contents. Decide whether you need nocks and a crimper at all. If you are starting from nothing, a bundled kit is genuinely cheaper. If you already own them, a bare square is the better purchase.
Form factor. T-shape for compound bows and mixed use, L-shape for longbows and traditional recurves. This one decision will save you more frustration than any material choice.
Weight. Anything around 22 to 30 grams disappears in a bow case. Heavier kits exist for a reason, but for measuring brace height, light is good.
Beyond the Bow Square: Bare Shaft and Paper Tuning
A bow square sets the starting conditions. It does not tell you whether your arrow spine matches your bow, and that is a different half of the same problem.
Once brace height is correct and your sight is marked, shoot a bare shaft alongside a fletched arrow. If the bare shaft flies to the same place as the group, your spine is close. If it points high, the arrow is too weak. If it points low, it is too stiff.
Paper tuning does the same job with a sheet of paper hung at arrow distance. Archers posting on hunting forums describe running shafts at several target weights to find where the group agrees with the bare shaft.
Traditional archers often work in the opposite direction, using World Archery Tuning for Tens to step brace height in tenths and watch how arrow flight responds. That method is well suited to bows where you would rather adjust the bow than change arrows.
Working out how far to bare shaft tune varies with draw weight and arrow speed, and there is no single number that suits every bow. Change one variable at a time, and change the square only when the reading has drifted.
Frequently Asked Questions
How do I measure the brace height on a compound bow?
Loosen both limbs, hook the short arm of a T-square into the riser pivot point, and let the long arm hang perpendicular to the bowstring without tilting it. Read where the string crosses the scale, measuring from the deepest point of the grip to the string. Compare that figure with the manufacturer specification, usually around 7.5 inches or 19 cm for a compound bow.
What is the recommended brace height for a compound bow?
Most compound bows ship specified around 7.5 inches, or 19 cm, and many modern designs run closer to 7.25 inches. Recurve bows commonly sit between 8 and 9 inches, or 20 to 23 cm, while traditional longbows often run lower. Always follow the figure for your specific bow rather than a general range, and treat that number as a reference point rather than a target to optimise.
How high should the nocking point be located on a recurve bow?
Set brace height first, then place the nocking point with a T-square clipped along the string so the long arm reads against the scale. Many recurve shooters use the centered zero rather than a measured offset, while others prefer to sit slightly above the perpendicular for a flatter release. The square makes the position repeatable, which matters more than the exact figure you choose.
Why is a longer brace height more forgiving?
A longer brace height puts the string at a shallower angle, which slows the arrow slightly and changes how the limbs load. That reduces the bow’s sensitivity to small setup errors and makes the launch more consistent when temperature, string tension or arrow spine changes. It also tends to quieten the release, at the cost of a little arrow speed.
What happens if brace height is too high?
A brace height that is too high shortens the string’s effective path, which slows the arrow and makes it stiffer to draw at brace. You will often see a duller release, a flatter shot and a group that wants to drift. Traditional coaches call this low brace height an exaggeration either way, and the fix is always to turn the string rather than the limb bolts.
Do I need a bow square or an RS level?
You need a square if you want the absolute brace height figure for your bow, because an RS level gives you a repeatable sight reference without that measurement. Long-teniture archers on ArcheryTalk run RS systems exclusively and concede a square mainly helps with nocking point setup. If you tune by sight marks alone, a level can work, but you lose the ability to detect brace height drift.
Which Bow Square Should You Buy?
If you shoot a compound or a recurve and own nothing else, buy the Zonon T-square and nock kit. It gives you the measuring tool, the crimper and six brass nocks in one package, and it carried the largest review base in this roundup at a 4.6 average with consistent praise for its laser etched markings and clip grip.
If you already own nocks and a crimper and want the most accurate reading available, buy the Easton T-Bow Square alone. At 22.68 grams with imperial and metric on opposite faces, it is the reference tool we trust for checking whether brace height has drifted.
For traditional longbows and long-draw recurves, the Easton L-square reaches further across the string and makes nocking point placement easier. For a tight budget and a throwaway field tool, the single SOPOGER aluminium square does the job, provided you check its squareness when it arrives.
Whichever you choose, use it every time you string the bow, again after the first hundred shots with a new string, and any time arrow flight changes unexpectedly. Ten seconds with a square is the cheapest tuning check in archery, and the best bow squares for tuning are simply the ones that still read the same number a year from now.