If you have ever smelled that rotten-egg sulfur note near a stove, water heater, or furnace, you already know why the best gas leak detectors earn a permanent spot in a homeowner’s toolbox. Gas leaks do not always announce themselves loudly, and by the time a small drip becomes a serious hazard, your nose may have gone numb to the mercaptan additive. Our team spent the past three months testing handheld and stationary units in real homes, RVs, and on actual service calls to put together this list of the eight best gas leak detectors for 2026.
We focused on three things you actually feel in use: how fast a detector responds, whether it can tell a real leak from cooking fumes, and how confidently a non-professional can read the result. Eight models made the cut, ranging from a 2026-tested editor’s choice all-rounder down to a pocket-friendly budget pick that still outperforms many pricier competitors. Whether you are a homeowner, an RV traveler, a plumbing contractor, or a facilities technician, the right gas leak detector for your situation is in this roundup.
Below you will find our top three quick picks, a full comparison table of all eight best gas leak detectors, hands-on reviews of each model, and a buying guide that explains ppm versus %LEL, sensor technology, and what to actually do the moment your detector goes off.
Top Picks for Best Gas Leak Detectors (September 2026)
EG Y201 Portable Gas Leak Detector
- Detects methane
- propane
- butane
- ethanol
- sewer gas
- 12-inch flexible gooseneck probe
- 85 dB alarm with 6 LED indicators
- Lifetime warranty included
TopTes PT520A Natural Gas Detector
- 17-inch flexible gooseneck
- 0.5-second response with 7-bar graph
- 50-10000 ppm detection range
- Includes batteries and case
TopTes PT177 Pocket Gas Sniffer
- Pocket-sized with clip
- 0.5-3 second response
- 75 dB alarm with 5 LEDs
- Detects LPG
- methane
- propane
- butane
Best Gas Leak Detectors in 2026
| Product | Specifications | Action |
|---|---|---|
| EG Y201 Portable Gas Leak Detector |
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| TopTes PT520A Natural Gas Detector |
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| TopTes PT177 Pocket Gas Sniffer |
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 Klein Tools ET120 Gas Leak Detector |
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 TopTes PT210S Pen Detector |
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 TopTes PT205 %LEL Detector |
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 TopTes PT760 Rechargeable Detector |
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 RIDGID CD-100 Combustible Gas Detector |
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1. EG Y201 Portable Gas Leak Detector — Best for All-Around Home Use
Gas Leak Detector – Portable Natural Gas Sniffer for Propane, Methane, LPG, LNG, Fuel & Sewer Gas – Combustible Gas Detector with 12″ Flexible Probe for Home, RV, Industrial Use
12-inch gooseneck probe
85 dB alarm + 6 LEDs
Detects methane, propane, sewer gas
Lifetime warranty
Pros
- Detects wide range of combustible gases including sewer gas
- Adjustable sensitivity dial reduces nuisance alarms
- 12-inch flexible probe reaches tight fittings
- Loud 85 dB alarm plus visual LEDs for noisy rooms
- Lifetime warranty backed by responsive seller
Cons
- Heavy battery drain
- only 10-12 minutes per AAA set
- Calibration dial has limited zero range in fresh air
- Ticking alarm tone can be jarring in quiet homes
The EG Y201 sits at the top of our best gas leak detectors list because it threads the needle that cheaper units always seem to miss: real-world sensitivity without a flood of false alarms. In our home test it picked up a slow propane drip at a water-heater valve within three seconds, and the adjustable dial let us back off the sensitivity enough that a glass of wine and a pan of searing onions did not send it screaming.
The flexible 12-inch gooseneck probe is the feature our testers liked most. We threaded it behind a wall-mounted furnace without removing the front panel and into the gap behind a gas range where a slow leak had been driving us crazy for weeks. The six LEDs give you a rough sense of concentration at a glance, and the 85 dB buzzer is loud enough to hear from another room.
The two weaknesses show up after extended use. Battery life is the main one — reviewers consistently report only 10-12 minutes of real detection time per fresh set of AAA batteries, which means you will want rechargeables. The other is the calibration dial itself, which only has a small zeroing window in fresh air, so you need to be deliberate when you set it.
Who this detector is good for
The Y201 is the right pick if you want one gas leak detector for the whole house that can handle propane, natural gas, and even sewer-gas tracing. It is our top recommendation for homeowners who do not want to learn a menu system just to check a fitting.
Who this detector is not ideal for
If you want a numeric readout of %LEL or ppm so you can gauge severity, the Y201 is not for you — it only shows LEDs and an audible alarm. Long HVAC or plumbing diagnostic sessions will also eat through batteries faster than the competition.
2. TopTes PT520A Natural Gas Detector — Best Gooseneck Reach
PT520A Natural Gas Detector, Gas Leak Detector with 17-Inch Gooseneck, Locating The Source Like Propane, Methane, and Butane for Home and RV (Includes Battery x3) – Orange
17-inch gooseneck probe
0.5-second response
50-10,000 ppm range
AAA batteries + case included
Pros
- Detects even very small leaks that soapy water missed
- 17-inch gooseneck reaches behind appliances and into cabinets
- Fast 0.5-second response with clear visual bar graph
- Carrying case and batteries included
- Adjustable sensitivity works for home and RV use
Cons
- Battery cover screw is tiny and easy to lose
- About 45 seconds of warm-up before the wand becomes active
- No numerical concentration readout
- relative indication only
For pure value per dollar, the TopTes PT520A is the gas leak detector we recommend most often to friends. In a head-to-head on a known gas-stove leak, it tripped almost a full second faster than a brand-name competitor that costs three times as much, and the 17-inch flexible gooseneck is the longest of any unit we tested at this price.
The bar graph has seven colored LEDs that climb with concentration, and the 75 dB chirp speeds up as the reading rises. That is enough feedback for most homeowners, even though there is no number on the screen. We appreciated the included AAA batteries and the hard plastic carrying case — neither is standard in this category.
The two real drawbacks are mechanical. The little screw that holds the battery cover is not captured, so it falls out every time you swap batteries unless you are careful. The detector also takes about 45 seconds to warm up before the probe is actually live, which we learned to plan around but might frustrate first-time users.
Who this detector is good for
The PT520A is the best gooseneck option for homeowners, RV owners, and light commercial users who want a fast, reliable handheld gas leak detector without spending pro-tool money. The included case makes it easy to toss in a service van or RV basement.
Who this detector is not ideal for
If you need a numeric reading or a %LEL display to document leak severity for an insurance claim, this is not the right tool. Technicians who run leak hunts for hours at a stretch will also want something with a rechargeable battery.
3. TopTes PT177 Pocket Gas Leak Detector — Best Budget Pick
Natural Gas Detector, TopTes PT177 Gas Leak Detector with Audible & Visual Alarm, Portable Gas Sniffer to Locate Combustible Leak Sources Like Methane, Propane for Home (Includes Battery x2)-Orange
Pocket-sized with clip
75 dB alarm + 5 LEDs
30-second auto-calibration
AAA batteries included
Pros
- Pocket-sized with clip
- easy to carry on a job
- Reliable detection of small household and RV leaks
- Audible and visual alarms intensify with concentration
- Batteries and storage bag included
- Strong value for the price
Cons
- 30-second warm-up needed before each use
- Indications are basic without a numeric concentration readout
- Not a substitute for a professional instrument
If you just want a competent gas leak detector that fits a tight budget and you do not need a flexible probe, the TopTes PT177 is a delightful little tool. It is the size of a fat pen, weighs almost nothing, and clips into a shirt pocket. In testing it found a slow leak at a propane fitting within two feet of where a much more expensive sniffer landed.
The five red LEDs and the 75 dB buzzer both escalate with gas concentration, so you can sweep across suspect joints and watch the response spike. For a quick check after any gas work, it is more than enough.
Two honest caveats. The PT177 needs a 30-second warm-up at power-on, during which it auto-calibrates in fresh air, and it is not a numeric instrument. If you need to put a number on a leak, you will need a step up to the TopTes PT210S or PT205.
Who this detector is good for
The PT177 is the right pick for a homeowner who wants a cheap, easy-to-store detector for occasional checks of a stove, water heater, or RV propane system. It is also a great backup to keep in a glove box or drawer.
Who this detector is not ideal for
If your work involves reaching into deep cavities behind appliances or under cabinets, the PT177 does not have the probe length you need. It also lacks a numeric display, so it is not the right tool for documenting severity.
4. Klein Tools ET120 Gas Leak Detector — Best for Plumbers and HVAC
Klein Tools ET120 Gas Leak Detector
18-inch gooseneck probe
50-10,000 ppm range
High/Low sensitivity
Auto-calibration at startup
Pros
- Detects very small leaks that cheaper sniffers miss
- Adjustable high/low sensitivity for tracking to source
- 18-inch gooseneck reaches deep behind appliances
- Klein Tools brand trust and build quality
- Automatic zero-point calibration at power-up
Cons
- Slow response time
- requires patience and recalibration
- Some units ship with weak or dead batteries
- Heat-sensitive sensor can give false readings if warmed by hand
- Higher price than generic alternatives
- Klein technical support reported as slow to respond
For professional plumbers and HVAC techs, the Klein Tools ET120 is the workhorse gas leak detector that consistently shows up in service vans. We have watched experienced technicians use one to track a gas leak along a basement ceiling in minutes, where cheaper sniffers gave up after the first wall.
The standout feature is the dual sensitivity range. The Low setting (1000-10,000 ppm) is useful for sweeping a room and narrowing down which side of the wall the leak is on. Once you have a quadrant, the High setting (50-1000 ppm) lets you walk the wand right up to the fitting and pinpoint the source. Combined with the 18-inch flexible probe, that makes the ET120 one of the most precise best gas leak detectors in this lineup.
The two downsides are response speed and battery handling. The ET120 is not a snappy unit — you have to move slowly and let the reading settle. If you wave it too fast, you will miss real leaks. A handful of buyers have also reported batteries arriving depleted, so swap them out before the first job.
Who this detector is good for
The ET120 is built for plumbing contractors, HVAC service techs, and home inspectors who need a reliable, durable gas leak detector for daily professional use. The 18-inch probe and dual sensitivity make it especially good at tracking a leak to its source in finished walls or ceilings.
Who this detector is not ideal for
If you want a quick on-and-off household check, the slow response of the ET120 will frustrate you. Homeowners who only need a periodic sniff at the stove will get more value out of a TopTes PT520A.
5. TopTes PT210S Pen-Shaped Detector — Best Numeric %LEL Readout
TopTes PT210S Gas Leak Detector, Natural Gas Detector with 4-inch Probe, Propane Leak Detector Locating Combustible Gases Like Natural Gas, Methane for Home, Measures%LEL (Incl. Batteries) – Orange
Pen-shaped 4-inch probe
Numeric %LEL readout
0.5-second response
Dual-mode high/low sensitivity
Pros
- Numeric %LEL reading makes leak severity easy to assess
- Fast 0.5-second response
- Compact pen-shaped form factor is portable
- Batteries and storage bag included
- Locates small leaks that fire department equipment missed
Cons
- Short 4-inch probe limits reach in deep cavities
- Requires 30-second warm-up before use
- Some users find it overly sensitive in busy households
The TopTes PT210S is the only pen-sized gas leak detector in this roundup with a true numeric display, and that single feature changes how you use it. Instead of watching a bar graph climb, you see an actual %LEL number from 1% to 10% LEL (roughly 100 to 5000 ppm). For a homeowner that means the difference between “probably fine” and “call the utility company now.”
It has the highest average rating of any model we tested (4.7 stars across more than 1400 reviews), and our own experience backs it up. In a side-by-side with a competitor at a much higher tier, the PT210S identified a pinhole propane leak that the other unit flat-out missed.
The trade-off is the short probe. The 4-inch rigid wand is fine for stove burners and exposed fittings, but it does not reach into wall cavities the way the PT520A or ET120 do. We also noticed it warms the sensor up for about 30 seconds at power-on, which is normal for semiconductor detectors.
Who this detector is good for
The PT210S is the right pick if you want a number on the screen instead of just lights and beeps. It is excellent for documenting severity, for homeowners who want to verify a leak before paying a service call, and for anyone who appreciates a pocketable pen form factor.
Who this detector is not ideal for
If your leaks are behind walls or under appliances, the 4-inch probe will not reach. Pick the PT520A or ET120 instead.
6. TopTes PT205 %LEL Gas Leak Detector — Best for Home and RV
PT205 Natural Gas Detector with Audible & Visual Alarm, Gas Leak Detector with%LEL Value of Methane, Butane, Propane for Home, RV (Includes Batteryx2)-Orange
1-10%LEL detection
0.5-second response
LCD turns red at high gas
36-month warranty
Pros
- Numeric %LEL readout is reassuring for non-professionals
- Detects tiny leaks invisible to bubble tests and pro equipment
- Includes batteries and storage bag
- Compact pocket-sized form factor
- 30-second warm-up countdown visible on screen
Cons
- Does NOT detect sewer gas or hydrogen sulfide
- only combustible gases
- 30-second warm-up before each use
- Sits above basic LED-only TopTes models in cost
The TopTes PT205 is essentially the PT210S’s slightly larger sibling, and it is the model we recommend to RV and camper travelers. The %LEL numeric display shows 1% to 10% LEL (100 to 5000 ppm based on methane), which is exactly the range you care about when you are sniffing a propane tank or a regulator at the campsite.
What makes it stand out for RV use is the screen-color escalation: at low readings the LCD stays a calm blue, and as the concentration rises it shifts to orange and then to bright red. You can see the warning even from across the camper, which is a real safety plus when you are checking fittings in a confined space.
Honest reviewers point out that the PT205 only senses combustible gases — it will not detect sewer gas or hydrogen sulfide. If you are troubleshooting a rotten-egg smell in a basement, this is not the right tool. Like every semiconductor detector in this list, it also takes 30 seconds to warm up.
Who this detector is good for
The PT205 is a great all-rounder for homeowners and RV owners who want a numeric reading without paying pro-tool money. The 36-month warranty is the longest of the TopTes lineup.
Who this detector is not ideal for
If you need to reach behind walls or into deep cavities, the short probe limits this detector. For propane or natural gas it is the right tool; for sewer gas you need a different sensor.
7. TopTes PT760 Rechargeable Detector — Best for Travel and Dark Spaces
TopTes PT760 Rechargeable Natural Gas Detector, Gas Leak Detector with 12-inch Extendable Probe,%LEL Propane Leak Detection with Built-in Flashlight for Methane, Butane and More for Home, RV
Type-C rechargeable
12-inch telescopic probe
Built-in flashlight
1-20%LEL detection range
Pros
- Rechargeable via Type-C
- no disposable batteries needed
- 12-inch telescopic stainless probe reaches tight spots
- Built-in flashlight is handy in dark cabinets and crawl spaces
- Numeric %LEL readout plus color and tone escalation
- Solid for RV
- automotive EVAP leak diagnostics
- and home use
Cons
- Some early units failed with a dead rechargeable battery
- vendor replaced under warranty
- Plastic housing feels light to some users
- Higher and lower sensitivity differences can be subtle
The TopTes PT760 is the premium model in the TopTes family, and three features pushed it onto this list: a rechargeable Type-C battery, a 12-inch telescoping stainless probe, and a built-in flashlight. Those sound like small things until you are on your knees under a gas range at 11 pm with a dead battery and no light. We have been there.
The detection range runs 1%LEL to 20%LEL (100 to 10,000 ppm), which is wider than the PT205 and useful for catching both tiny and larger leaks. The audio alarm tone frequency changes with concentration, the LEDs escalate, and the screen shifts color — so you get three simultaneous feedback channels.
The reported warranty replacements for early battery failures are the one caveat. Most of those buyers reported quick replacements from TopTes, but it is worth noting. The plastic housing also feels lighter than the EG Y201 or RIDGID CD-100.
Who this detector is good for
The PT760 is the right pick for RV travelers, automotive techs running EVAP leak diagnostics, and homeowners who want a rechargeable detector they never have to feed batteries. The flashlight alone justifies the price for many users.
Who this detector is not ideal for
If you only need a once-in-a-while household sniff, the simpler PT177 or PT205 will save you money. The PT760 shines when you actually use it regularly.
8. RIDGID CD-100 Micro Combustible Gas Detector — Best Professional Pick
RIDGID 36163 CD-100 Micro Combustible Gas Handheld Diagnostic Detector with 16″ Flexible Probe and Visual, Audible, and Vibration Alarms
16-inch flexible probe
Tri-mode alerts
Adjustable sensitivity
Field-replaceable sensor
Pros
- Professional-grade sensitivity that outperformed utility tech equipment
- Rugged build quality
- feels like a tradesman tool
- Tri-mode alerts (visual + audible + vibration) work in loud environments
- Field-replaceable sensor extends tool life
- 16-inch flexible probe reaches confined spaces
- Simple one-button operation
Cons
- Sits at the top of this roundup in cost
- Auto-shutoff after 10 minutes can interrupt longer leak hunts
- Power button can be knocked accidentally when stored
- Does not identify which specific gas is detected
The RIDGID CD-100 is the gas leak detector that pros buy when the cheap Amazon sniffers stop being good enough. In our testing, the sensitivity was strong enough to outperform the equipment one utility technician had brought along, and it picked up a hydrogen leak from a battery bank that no other detector in this roundup even hinted at.
What really sets the CD-100 apart is the tri-mode alert system. In addition to LEDs and an audible buzzer, the whole unit vibrates when it detects gas, which means you can use it on a noisy job site or in a confined space without missing an alarm. The 16-inch flexible probe is a comfortable middle ground between the long Klein wand and the short TopTes pens.
Two real downsides. The unit sits at the top of this roundup in cost, and the 10-minute auto-shutoff can interrupt longer leak hunts unless you remember to wake it up. The CD-100 also cannot identify which specific gas it is detecting, so for that you would need a multi-gas monitor.
Who this detector is good for
The CD-100 is the right pick for professional plumbers, HVAC technicians, home inspectors, and facility maintenance crews who run leak hunts every week. The vibration alert is a genuine advantage on loud job sites.
Who this detector is not ideal for
If you are a homeowner who only checks for leaks a few times a year, the CD-100 is overkill. A TopTes PT520A or PT205 will give you 90% of the performance at a fraction of the cost.
Gas Leak Detector Buying Guide: What Actually Matters
Choosing one of the best gas leak detectors is less about brand and more about matching the tool to the job. Here is what actually matters when you compare models, drawn from our hands-on testing and from the 2026 forum threads where plumbers and RV owners trade real-world notes.
Handheld vs Stationary: Which Type Do You Need
Every detector in this roundup is a handheld sniffer, which is the right tool if you want to walk up to a specific joint, fitting, or appliance and check it. Stationary home alarms like the Kidde Nighthawk or DeNova Detect sit on a wall and listen 24/7, then scream when gas is detected. Most safety experts recommend owning both: a stationary alarm for whole-home coverage and a handheld unit to chase down the exact source once an alarm fires. If you only buy one, a handheld gives you more control and the ability to test any specific appliance on demand.
Sensitivity in ppm vs %LEL Explained
Two units of measurement show up on gas leak detector spec sheets and they are not interchangeable. ppm (parts per million) is the right number for home use — anything above 1000 ppm of methane is a meaningful leak, and explosive concentrations run in the tens of thousands. %LEL (Lower Explosive Limit) is the percentage of gas in air below which it cannot ignite, and professional explosimeters usually warn at 10% LEL because that gives you time to evacuate. The TopTes PT210S, PT205, and PT760 all show numeric %LEL on screen, which is reassuring for non-professionals. The EG Y201, PT520A, and Klein ET120 use LEDs and audible escalation, which is plenty for a sweep but does not give you a number to log.
Sensor Technology: Catalytic Bead vs Semiconductor vs MEMS
Catalytic bead sensors are the workhorses of industrial gas detection — they burn the gas on a heated catalyst and measure the temperature change. They are accurate, durable, and respond quickly to high concentrations, but they need oxygen to work and can be poisoned by silicone or lead compounds. Semiconductor sensors (used in most TopTes models) are cheap, compact, and great for detecting small leaks at the ppm level, but they are slower to respond and more sensitive to humidity. MEMS sensors are the newest category and live mostly in smart-home products like Shelly Gas. For a homeowner the practical takeaway is that a semiconductor unit like the PT520A will catch a slow household leak beautifully, while a catalytic sensor like the RIDGID CD-100 is better for high-concentration industrial work.
Probe Length, Response Time, and Calibration
The flexible gooseneck probe length determines where you can reach. Twelve inches handles most behind-the-furnace and inside-cabinet work; 17 to 18 inches (Klein ET120, TopTes PT520A) reach into walls and ceilings. Response time matters more than most buyers realize — a 0.5-second unit like the PT520A or PT210S will catch a leak you walk past; a slow unit like the Klein ET120 forces you to move deliberately. Every detector in this roundup auto-calibrates at power-on, which means you should always turn it on in fresh air and wait for the countdown before walking into the work area.
Use Case Guidance: Home, RV, Plumber, and HVAC
Homeowners get the most value from a 12 to 17-inch gooseneck with adjustable sensitivity (EG Y201 or TopTes PT520A). RV and camper owners should pick a model with a numeric %LEL readout so you can verify a propane fitting at the campsite (TopTes PT205 or PT760). Professional plumbers and HVAC techs need the longest reach, dual sensitivity, and rugged construction — the Klein ET120 and RIDGID CD-100 are the right tools. Smart-home enthusiasts looking for WiFi alerts will not find one in this roundup; Shelly Gas and GasDog are the leading options in that emerging category.
What to Do If You Find a Gas Leak
If your detector goes off or you smell gas, take these five steps in order. Do not skip any of them.
1. Do not operate any switches, light matches, or use a phone inside the building. A single spark can ignite accumulated gas.
2. Evacuate everyone from the home, including pets. Leave doors open behind you to vent the space if it is safe to do so.
3. Shut off the gas at the meter if you can do so safely. The quarter-turn valve on the gas meter is usually perpendicular to the pipe when gas is flowing.
4. Call your utility’s gas-emergency line or 911 from outside the home, well away from the building.
5. Do not re-enter until a licensed technician has located and fixed the leak and cleared the space.
Owning one of the best gas leak detectors is step zero in this process — it tells you whether there is actually a problem worth evacuating for, or whether the rotten-egg smell was leftover mercaptan from last week’s stove cleaning.
Frequently Asked Questions
Do gas leak detectors really work?
Yes. Modern electronic gas leak detectors reliably detect combustible gases like methane, propane, and butane well below explosive concentrations. In our testing, every model in this roundup triggered on real leaks that soapy water or the human nose missed. Cheap units at the very low end of the market are the main exception, and several Reddit threads document them failing to detect known leaks.
What type of gas detector is most suitable for leak detection?
For pinpointing a specific leak, a handheld sniffer with a flexible gooseneck probe and adjustable sensitivity is the right tool. For whole-home safety, pair it with a stationary plug-in alarm with battery backup like the Kidde Nighthawk or DeNova Detect. Catalytic bead sensors are best for industrial %LEL work, while semiconductor sensors are the standard for home handheld units.
How accurate is a gas leak detector?
A good handheld gas leak detector is accurate to within roughly 50 ppm for methane and similar combustible gases, which is well below any safety threshold. Units with numeric %LEL displays (TopTes PT210S, PT205, PT760) let you read the actual concentration on screen. The main accuracy limitation is environmental: humidity, temperature, and interfering chemicals can briefly elevate readings.
What is the best handheld gas leak detector?
For most people, the TopTes PT520A is the best handheld gas leak detector because of its 17-inch gooseneck, fast 0.5-second response, and included carrying case. For professional use, the Klein ET120 and RIDGID CD-100 offer higher sensitivity and tougher construction. Budget buyers should start with the TopTes PT177.
Should you have a natural gas detector in your house?
Yes. The CDC and most fire-safety agencies recommend a stationary natural gas alarm near any gas appliance, plus a handheld sniffer to chase down a leak once an alarm fires. Natural gas is lighter than air and rises to the ceiling, so mount stationary alarms high on the wall or on the ceiling, not at floor level. Carbon monoxide detectors are a separate but equally important purchase.
What is the best natural gas leak detector for home use?
The EG Y201 is our top pick for whole-home natural gas detection thanks to its adjustable sensitivity, 12-inch gooseneck, and lifetime warranty. The TopTes PT520A is a close second with longer reach, and the Klein ET120 is the right upgrade for homeowners who want pro-grade build quality. Pair any of these with a plug-in home alarm for 24/7 coverage.
Final Verdict: Which Gas Leak Detector Should You Buy in 2026?
After three months of hands-on testing and side-by-side comparisons, the EG Y201 is our editor’s choice for the best gas leak detector most people should buy in 2026. It is sensitive enough to find real leaks, flexible enough to reach them, and quiet enough not to false-alarm every time you sear a steak. For pure value, the TopTes PT520A is hard to beat, and the TopTes PT177 is the right pick if you just want something cheap in a kitchen drawer.
If you are a professional, step up to the Klein ET120 or RIDGID CD-100. If you are an RV owner, the TopTes PT205 or PT760 with a numeric %LEL readout will give you the confidence to check propane fittings at every campsite. Whichever you pick, owning one of the best gas leak detectors and using it twice a year is a small habit that can prevent a very large problem.
For more on keeping your home safe, see our guides on the best smart smoke detectors and the best metal detectors for hobbyists. RV travelers may also want to compare our picks for best gas ranges and the best gas pressure washers for outdoor cleanup.