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Klein Tools ET120 Gas Leak Detector

  • Based on 1,885 reviews
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Availability: In Stock.
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Arrives Thursday, Oct 22
Order within 18 hours and 36 minutes
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Style: Standard


Features

  • WIDE DETECTION RANGE: Detect gas concentrations from approximately 50 to 10,000 ppm* (*based on Methane) for versatile gas monitoring
  • ADJUSTABLE SENSITIVITY: Choose between High (50 to 1000 ppm) and Low (1000 to 10,000 ppm) sensitivity levels for accurate gas detection
  • ENHANCED VISUAL AND AUDIBLE ALERTS: Stay alerted with five red LED's (visual) and 85dB audible alerts that intensify as gas concentration increases
  • EASY CALIBRATION: Automatic zero-point calibration at power-up ensures accuracy; flashing lights during self-calibration, no gas presence indicated
  • FLEXIBLE GOOSENECK DESIGN: Expand the sensor's reach with the 18-inch flexible gooseneck that conveniently clips onto the meter for storage

Description

The ET120 is it the perfect choice for HVAC professionals. It is an easy-to- use tester that provides audible and visual alarms in the presence of methane, propane and other combustible gases at concentrations as low as 50 ppm. It features two levels of sensitivity depending on users' needs: High (approximately 50 to 1000 ppm) and Low (approximately 1,000 to 10,000 ppm). For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.

Brand: KLEIN TOOLS


Style: Standard


Power Source: Battery Powered


Color: Black


Product Dimensions: 1.79"D x 2.71"W x 28.3"H


Item Weight: 13 ounces


Alarm: Audible


Operating Humidity: 85 percent


Global Trade Identification Number: 48


Material: Blend


Brand: KLEIN TOOLS


Model Number: ET120


Global Trade Identification Number: 48


Manufacturer Warranty Description: Please refer to attached warranty document.


Unit Count: 1 Count


Number of Items: 1


Item Highlight: Combustible Gas Leak Tester with 18-Inch Gooseneck Has Range 50 - 10,000 ppm, Includes Pouch and Batteries


Manufacturer: Klein Tools


UPC: 092644690648


Built-In Media: Batteries, Carrying Pouch


Item Type Name: Combustible Gas Leak Detector


Mfr Part Number: ET120


Power Source: Battery Powered


Alarm: Audible


Operating Humidity: 85 percent


Product Style: Standard


Color: Black


Item Dimensions D x W x H: 1.79"D x 2.71"W x 28.3"H


Item Weight: 13 ounces


Enclosure Material: Blend


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Oct 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Excellent detector from a pro-level company
Klein Tools also makes a pen style detector but I did not need one that fits in a shirt pocket. So I went with the full-sized user interface and gooseneck. The gooseneck was convenient for some spots. I read a lot of reviews where no detection occurs so I tested it in a safe way and it detected immediately on a tiny amount of natural gas at the most sensitive setting. I think people blast the device with a ton of gas when testing and maybe that overloads it. Detection range is in a range measured in parts per MILLION so keep that in mind. Anyway, Klein Tools is an old top of the line company and I would go with them. The price is reasonable. Very easy to use and read what is going on. It’s very much an important tool to have to keep things safe. ... show more
Reviewed in the United States on July 11, 2026 by Leon

  • 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. ... show more
Reviewed in the United States on July 11, 2025 by taikodog

  • Excellent device at the right price
I used this device to track down a gas leak in my rental property. A tenant kept complaining about a "strong gas odor" but neither I nor other tenants were able to smell it. With this device, I immediately picked up a low level presence of gas in the building, and tracked it down to exactly where it was entering the building along the electrical service conduit coming from the street. A major leak had developed in the underground main and gas was seeping through the ground into openings in the surrounding buildings. This device responds to changes in the amount of gas within 1-2 seconds, quickly enough to sweep around and pinpoint the source. It takes one minute to warm up and calibrate in fresh air, then you enter the area on high sensitivity, switch to low when you max out, and continue until you find the source. Easy. I have owned other Klein tools in the past and they have never disappointed. This one is no exception. It's a bit more expensive than the cheapest no-name options sold on Amazon, but you really can't put a price on peace of mind and quality. ... show more
Reviewed in the United States on January 15, 2021 by Mr. G

  • 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.
Reviewed in the United States on January 30, 2026 by Leonardo j Gonzalez Corbos

  • Pricey, but saved me a lot of $$
Gas company said there were no leaks after I called in a complaint stating I was losing propane even without the fireplace running. This device showed a pretty substantial leak. I met the service guy and showed him what it was seeing, and he confirmed he missed the leak. They agreed to refill the 120# tank for free. Saved me a lot of $$. ... show more
Reviewed in the United States on September 17, 2026 by David

  • 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. ... show more
Reviewed in the United States on November 6, 2020 by C. Burns

  • 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.
Reviewed in the United States on March 3, 2026 by Business School Prof

  • Very low beeping sound
This is just an average lp leak detector .......... It has a bar graft with lights to show how strong the leak is. But the biggest drawback is the beep mode is sooooo faint you can't hardly hear it. If you have your head in a tight spot trying to put the probe on a leak and you can't keep your eyes on the meter and rely on the beep this meter is absurdity useless to a tradesman but for a home owner using it once a year it might work for them okay. What a shame Kline would sell a useless meter like this. ... show more
Reviewed in the United States on June 8, 2022 by Arizona kid

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