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Klein Tools ET120 Gas Leak Detector — Combustible (18-in Gooseneck, 50-10,000 ppm)
$129.97
Final price set by Amazon · may vary
Editor’s note: the Klein Tools ET120 gas leak detector is one of the instruments we curate in our Gas Leak Detectors buyer’s hub. Compare it with the Forensics Gas Leak Detector below before you order. Expert rev...
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Editor’s note: the Klein Tools ET120 gas leak detector is one of the instruments we curate in our Gas Leak Detectors buyer’s hub. Compare it with the Forensics Gas Leak Detector below before you order.
Expert reviews & buying guides: Read our full Klein Tools ET120 review. See our best gas leak detector guide. Compare it: Combustible Detector vs Leak Detector.
Klein Tools ET120 Gas Leak Detector — Combustible Gas Tester
The Klein Tools ET120 gas leak detector pinpoints combustible gases such as natural gas (methane), propane and butane with an 18-inch gooseneck and adjustable sensitivity — the gas leak detector trades and facilities reach for to trace a leak to its exact source. It locates the leak; it does not measure whether the air is safe to breathe.
Jump to: Features · Specs · What it detects · Comparison · FAQ
The Klein Tools ET120 is a handheld combustible gas leak detector with an 18-inch gooseneck probe, a 50-10,000 ppm range and adjustable sensitivity for pinpointing natural-gas and propane leaks.
Key features
- Pinpoints combustible-gas leaks from 50 to 10,000 ppm across a wide sensitivity range
- 18-inch flexible gooseneck reaches behind appliances, under fittings and into tight joints
- Adjustable sensitivity to find the area first, then dial in the exact leak point
- Audible tick-rate plus visual indication that climbs as you near the source
- Most-reviewed leak detector we stock (1,800+ ratings, 4.6 stars)
- Includes a storage pouch and batteries
Pros
- Trusted Klein Tools build
- Long 18-inch gooseneck probe
- Wide 50-10,000 ppm range
- Adjustable sensitivity for pinpointing
- Outstanding 4.6-star, 1,800+ review record
Cons
- Locates leaks — does not measure whether an atmosphere is safe
- Combustible gases only (not refrigerants or toxics)
- Battery (not rechargeable)
- Not a confined-space entry instrument
Specifications
| Specification | Detail |
|---|---|
| Finds | Combustible gases (natural gas, methane, propane) |
| Range | 50–10,000 ppm |
| Probe | 18-inch flexible gooseneck |
| Sensitivity | Adjustable |
| Alarm | Audible tick-rate + visual |
| Included | Pouch and batteries |
| Weight | 13 oz |
Where the Klein Tools ET120 fits
- Natural-gas line and appliance leak checks
- Propane and LP system service
- Post-repair pressure-test verification
- Plumbing and HVAC gas work
- Facilities maintenance leak surveys
What the Klein Tools ET120 detects (and what it doesn’t)
The ET120 finds combustible gases such as natural gas (methane), propane and butane — it does not detect refrigerants, carbon monoxide, oxygen levels or specific toxics. For refrigerant work choose a Fieldpiece DR58 or Elitech ILD-200; for CO use the Carbon Monoxide Alarms & Detectors range. Crucially, a leak detector tells you where gas escapes, not whether a space is safe to enter — for that, use a Portable Gas Detectors monitor or a Personal & Wearable Gas Detectors clip. Adjustable sensitivity lets you locate the area, then pinpoint the joint.
Cross-shopping? This unit sits in our Gas Leak Detectors hub alongside Forensics Gas Leak Detector, TopTes PT-830S, TopTes PT520A, TopTes PT210S. For other gas-detection form factors see Portable Gas Detectors, Personal & Wearable Gas Detectors, Fixed Gas Detection Systems, or browse the full Gas Detectors range.
How the Klein ET120 compares
The ET120 is a premium combustible leak detector with a long 18-inch gooseneck and a deep review record. For lower-cost combustible sniffers, compare the TopTes PT520A (17-in gooseneck) and TopTes PT210S; for a rechargeable color-display option, the TopTes PT-830S.
- Choose the Klein ET120 for a trusted-brand combustible sniffer with a long gooseneck and the deepest review record.
- Save money with the TopTes PT520A or TopTes PT210S combustible detectors.
- Need refrigerant detection instead? See the Fieldpiece DR58.
Frequently asked questions
What does the Klein Tools ET120 detect?
It detects combustible gases such as natural gas (methane), propane and butane from 50 to 10,000 ppm. It does not detect refrigerants, CO or oxygen — for those, use the matching instrument from the Gas Detectors hub.
How long is the ET120 probe?
It has an 18-inch flexible gooseneck that holds its shape, so you can reach behind appliances, under fittings and into tight joints.
Can the ET120 tell me if a space is safe to enter?
No — it locates leaks, it does not measure concentration or oxygen. For entry safety use a Portable Gas Detectors gas monitor or a Personal & Wearable Gas Detectors clip.
How do I pinpoint a leak with adjustable sensitivity?
Start on high sensitivity to find the general area, then lower the sensitivity to zero in on the exact joint where the tick-rate peaks.
Is the ET120 rechargeable?
No — it runs on batteries, which are included along with a storage pouch. Keep spares for long survey jobs.
What is the detection range?
50 to 10,000 ppm of combustible gas, which covers everything from a faint trace to a substantial leak as you sweep a line.
Will the ET120 find a propane leak?
Yes — it detects propane and other combustible gases including natural gas and methane, making it suitable for LP system service.
How does it signal a leak?
An audible tick-rate and visual indication increase as gas concentration rises, guiding you to the source.
Does the ET120 detect refrigerant or CO?
No — it is combustible-gas only. For refrigerant use the Fieldpiece DR58; for carbon monoxide see the Carbon Monoxide Alarms & Detectors range.
Is it in stock and how does it ship?
Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.
Do I need to calibrate the ET120?
Combustible leak detectors are not field-calibrated like monitors; verify response against a known small gas source periodically so you trust the readings.
How does the ET120 compare to the TopTes combustible detectors?
The ET120 is a premium Klein-brand unit with an 18-inch gooseneck; the TopTes PT520A and PT210S are lower-cost alternatives.
Ready to order the Klein Tools ET120 gas leak detector? Add it to your cart above, or check the current Amazon price below. Compare it against the rest of our Gas Leak Detectors lineup before you buy.
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Why trust this Klein Tools page? WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications here are taken from the manufacturer’s published listing for Klein Tools ET120 and framed against OSHA 29 CFR 1910.146 and OSHA Permissible Exposure Limits. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or our lineup.
By Steven Eaton, WC Safety Editorial — Industrial safety-equipment desk · specialization: atmospheric monitoring, gas detection and instrument selection.
Last updated: · Sources reviewed: manufacturer product listing & specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.
Editorial standard: Zero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.
Last updated: · Sources reviewed: manufacturer product listing & specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.
Editorial standard: Zero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.
How this page is maintained. Specifications and pricing are reviewed against the manufacturer’s current listing and re-checked whenever the lineup changes. Gas-detection guidance follows OSHA 1910.146 and OSHA PELs, cross-referenced with ACGIH TLVs.
Disclosure. WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases through outbound links on this page (tag wcsafety04-20). We are not sponsored by any instrument manufacturer. This page is buyer guidance, not medical, legal or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).
Brand / Vendor
Klein Tools
Model / SKU
ET120
Product Type
Gas Leak Detector
Price
$129.97 (Amazon)
Rating
4.86 / 5 — 7 reviews
Availability
Check current availability on Amazon
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Verified Buyer Reviews
Customer Reviews
★★★★★4.6 / 5· 1,882 ratings on Amazon
★★★★★
Excellent, easy to use tool.
I tired other "sniffers" that were just completely worthless.This tool is very simple to operate and conclusively confirms whether there is a gas leak--and if so, where it is coming from. The variable response alert system shows the intensity of any leak, or even better, no leak at all. It is very clear, thereby imparting full confidence in the results.(Because it showed I did not have a leak at the time, I tested this by opening an unlit gas burner and "searched" for it. It worked perfectly.)An invaluable, easy too use tool for all-important peace of mind. Highly recommend.
Verified Purchaser · July 11, 2 · ✓ Amazon Verified Purchase
★★★★★
Works well and I trust Klein quality
There are very expensive professional level meters and a bunch of inexpensive Chinese meters out there. I don't need the pro tool and I don't trust the inexpensive one. I've been buying Klein tools for decades and they always perform well.I bought this because the gas alarm goes off in our travel trailer every once in a while and I want to find what the problem is. This came today and I tried it on the kitchen gas stove and on the NG BBQ outside. It seems that the high sensitivity setting is very sensitive and responsive. I turned on a burner in the trailer and it immediately went off. I opened the door and held the wand outside and up high and it went off. I brought it back inside and set it beside the burner (which was off) and it was still alerting with fast beeping and five bars. I went to the bedroom and turned on the fantastic fan which sucked air in the open door by the kitchen and exhausted it out the roof. After 15 seconds it dropped a bar and started beeping slower. After a minute the gas was exhausted and it stopped alerting.This seems to be an excellent product and is easy to use.
Verified Purchaser · November 6 · ✓ Amazon Verified Purchase
★★★★★
What a great nose this thing has!
I had an outdoor gas leak that I could not locate. My cheap gas detector registered nothing, when I could clearly smell gas. I purchased this unit and put it to work. Much better sensitivity, it clearly registered flammable gas when I could even faintly smell it. With a little patience, walking around the area, I was able to zoom in on sections with multiple bars and a louder audible pitch. I zeroed in to a section of pipe where I got maxed out readings and found a worn area of the pipe that was leaking. A little more expensive, but worth it, it works well.
Verified Purchaser · December 1 · ✓ Amazon Verified Purchase
★★★★☆
Sensitive
I use this gas leak detector at work, and it performs very well. It is easy to use, highly sensitive, and quickly detects gas leaks. The alarm is loud and clear, which helps improve safety on the job. It’s compact, reliable, and a great tool for professional use. I definitely recommend it.
Verified Purchaser · January 30 · ✓ Amazon Verified Purchase
★★★★★
Klein gas detector
Very prompt shipment. Klein gas sniffer is of professional quality. I found a small gas leak in newly installed hot water heater. Plumber had the same sniffer and laughed when he saw mine.
Verified Purchaser · March 3, 2 · ✓ Amazon Verified Purchase
★★★★★
The best value of money that I ever invested.
The best gas leak detector I ever bought. There are two safety gas leak. High level of detection, which I love it. And low level of detection, which still I love it. It will detect quick before your nose detect it. The best value of money that I ever invested.
Verified Purchaser · September · ✓ Amazon Verified Purchase
★★★★★
Worked fine!
I had a gas fume leak somewhere on my car.That was getting inside the car and this little tool did the trick and helped me locate and fix the problem! Very pleased!
Verified Purchaser · April 13, · ✓ Amazon Verified Purchase
Showing 7 of 1,882 Amazon reviews.
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