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KLEIN TOOLS

Klein Tools ET120 Gas Leak Detector, Combustible Gas Leak Tester with 18-Inch Gooseneck Has Range 50-10,000 ppm, Includes Pouch, Batteries

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Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Jul 12
Order within 14 hours and 59 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
  • COMFORTABLE AND DURABLE: Over-molded body provides a comfortable grip for prolonged use and is designed to withstand demanding environments
  • BATTERY SAVING FEATURE: Auto power-off after 10 minutes of non-usage conserves battery life, ensuring long-lasting operation

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


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


Brand: KLEIN TOOLS


Model Number: ET120


Global Trade Identification Number: 48


Manufacturer Warranty Description: Please refer to attached warranty document.


Number of Items: 1


Manufacturer: Klein Tools


UPC: 092644690648


Mfr Part Number: ET120


Unit Count: 1.0 Count


Item Type Name: Combustible Gas Leak Detector


Built-In Media: Batteries, Carrying Pouch


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Jul 12

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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Similar Products

Top Amazon Reviews

    • Excellent, easy to use tool.
Style: Standard
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
    • Works well and I trust Klein quality
Style: Standard
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
    • What a great nose this thing has!
Style: Standard
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. ... show more
Reviewed in the United States on December 13, 2025 by JPW
    • Sensitive
Style: Standard
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
    • The name says it all Klein
Style: Standard
I did not use the one I purchased. By the time it arrived I had used my friends which was the previous model. It was the same configuration. He had been using it with no issues in the HVAC Service/install field. We easily found a small leak in a wall and were able to easily pinpoint and confirm w bubbles. It was an economical choice from a quality manufacturer which I trust and have many hand tools and a meter. It is ruggedly constructed and easy to use. My only complaint is the case. It should be larger to accommodate the sensor probe without cramming it it. In concerns me as I feel it may wear out flexible head. The case could also be more rugged. Personally I would recommend it ... show more
Reviewed in the United States on May 24, 2022 by PB
    • Safety first! Safety first!
Style: Compact
Review Image by Daniel
We recently moved into a new apartment and noted a very strong chemical smell upon entering. This device helped us detect and locate a gas leak originating from a loose stove connection. We immediately reported this to maintenance, who, using their own professional device, detected 700 ppm(v). The Klein’s high-sensitivity range (100–1000 ppm) picked it up instantly, and the increasing scale/beeping allowed us to pinpoint the source underneath the stove. Easy to use, compact, portable, accurate, and convenient to have around. Highly recommended safety device. ... show more
Reviewed in the United States on April 12, 2026 Reviewed in the United States on April 12, 2026 by Daniel
    • Klein gas detector
Style: Standard
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
    • Worked fine!
Style: Compact
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!
Reviewed in the United States on April 13, 2026 by Amazon Customer

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