Search  for anything...

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

  • Based on 1,790 reviews
Condition: New
Checking for the best price...
$116.97 Why this price?
Labor Day Deal · 10% off was $129.97

Buy Now, Pay Later


As low as $19.50 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

Returnable until Jan 31, 2025

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Friday, Sep 5
Order within 23 hours and 20 seconds
Available payment plans shown during checkout

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: Combustible Gas


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


Number of Items: 1


Brand: ‎KLEIN TOOLS


Style: ‎Combustible Gas


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


Number of Items: ‎1


Manufacturer: ‎Klein Tools


UPC: ‎092644690648


Part Number: ‎ET120


Item Weight: ‎13 ounces


Item model number: ‎ET120


Batteries: ‎4 AAA batteries required. (included)


Is Discontinued By Manufacturer: ‎No


Pattern: ‎Detector


Item Package Quantity: ‎1


Measurement System: ‎Metric


Display Style: ‎Digital


Special Features: ‎Audible Alert, Auto-Power Off, Visual Notification


Included Components: ‎Batteries, Carrying Pouch


Batteries Included?: ‎Yes


Batteries Required?: ‎Yes


Battery Cell Type: ‎Alkaline


Description Pile: ‎4 x AAA


Date First Available: August 8, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Sep 5

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • 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

  • Great gas leak tester.
Only complaint I have with this, is the calibration takes 30 seconds outdoors but other than that it’s been working well for home inspections. Sensitivity on this is very dialed in as well.
Reviewed in the United States on July 7, 2025 by Omar A

  • Good tester
Why did you pick this product vs others?: Name.. Klein tools have always been top quality for me. Works well: Previous tester had false positives. This one works great,
Reviewed in the United States on June 24, 2025 by ComputerGuy666

  • Great leak detector for R290
I use this to look for leaks on refrigeration systems using R290. It works great but the power button is very sensitive. It it's soft case if anything bumps the front the power goes on and drains the batteries. Since I only use this for certain jobs I have to pull the battery pack out of the back so they will still have a charge the next time I need it. ... show more
Reviewed in the United States on December 21, 2024 by Colin Duffy

  • Easy to use
Had a natural gas leak that came and went. Many people trying to find where it was coming from but to no avail. I took a shot with this thinking that maybe this device would get me in the vicinity. I have had a few Klein tools and have had no issue with any of them. This worked flawlessly. As instructed, I set the meter to high sensitivity and walked through the 1800 sq ft open space. Turns out, an adjacent room was where the leak was located coming from the 1.5" mainline coming into the building from the meter. The leak was inside the block wall. Without this meter, there is no way I could have found it in a brick wall. After making the repairs, I tested the area again. No leak, no smell. So thankful that the tool was affordable and that our facility is safe. ... show more
Reviewed in the United States on January 16, 2022 by Michael McLean

  • GOOD TOOL
WORKS GREAT, DETECTS VERY SMALL GAS LEAKS.
Reviewed in the United States on July 1, 2025 by DEADEYE JON

  • Solid pro tool
Why did you pick this product vs others?: My very good plumbers embarrassingly didn't own one of these tools. We used it and immediately found 2 leaks they were unable to detect.
Reviewed in the United States on June 20, 2025 by DMH

  • Not the go to for this.
Works great, if it works. I'm on my 3rd one and it arrived DOA. Brand new batteries and all. Between that and the durability of the end & gooseneck, I'm over these. Sucks because normally Klein is the go to.
Reviewed in the United States on March 8, 2025 by Gobbo

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...