Search  for anything...
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

  • Based on 1,816 reviews
Condition: New
Checking for the best price...
$136.46 Why this price?

Buy Now, Pay Later

As low as $22.74 / 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, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026

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: Only 10 left in stock, order soon!
Fulfilled by Acme Tools
Arrives Friday, Dec 19
Order within 19 hours and 9 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

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). Gas Leak Detector with 18-Inch flexible gooseneck. Combustible gas detection range: 50 to 10000 ppm. Easy to use tester with audible and visual alarms. Over-molded body for comfortable grip. Auto power-off after 10 minutes of non- usage conserves battery life. Includes detector, 4xAAA batteries, instruction manual and storage pouch. 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


Material: Blend


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


Material: ‎Blend


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


Finish: ‎Brushed


Pattern: ‎Detector


Shape: ‎Rectangular


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


Warranty Description: ‎Please refer to attached warranty document.


Date First Available: August 8, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Dec 19

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.

Similar Products

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
    • Works well and sense odorless gases
Seems to work well and it’s easy to adjust sensitivity.
Reviewed in the United States on September 29, 2025 by Verona
    • Good Gas Sniffer
Easy to use. So far it is a great product!
Reviewed in the United States on November 8, 2025 by Trina
    • 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
    • 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.
Reviewed in the United States on September 30, 2025 by Doris
    • 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
    • Great tool, but there's a learning curve
We had bought a new house, and I kept thinking I sometimes caught a whiff of natural gas when I walked through the laundry area. I knew there was a capped off gas line behind the electric dryer. Natural gas is serious business so I got this detector, read the instructions, and started sniffing around. I found there was a leak, but not behind the dryer. It was the gas cutoff valve for the fireplace close by. My nose up against the valve confirmed this. I had a licensed plumber come and replace the valve. After finishing I tested the valve again and a small amount registered. The plumber said the detector was defective. I kept testing after the plumber left and the results slowly went back to zero after about 30 minutes. I figured that, at as low as 50 ppm, some very small amounts of whatever the detector detects linger for some time before total absence. Over the next couple of days I worked the valve and retested and it always registered zero. For something this expensive I wish the sensor lasted more that five to seven years. ... show more
Reviewed in the United States on May 10, 2022 by digger
    • Had to fix it before I could use it, NOT Klein's fault
The Klein detector itself is 5-star. I rated it lower because of how I received the item and its condition. It was an Amazon used item at reduced cost, but I expected the item to atleast have been checked to see if it worked. Upon receiving, i tried powering it on, nothing happened. So I checked to seen if it had batteries in it, it did. I noticed the one battery was not installed in the battery cartridge correctly and I attempted to fix that. But it wouldn't stay in. After looking a bit more at it, I saw that the metal terminal connections for the batteries were missing on the one side and these would hold the batteries in place and also make the needed contact to the device to power it. I am a bit of a MacGyver so I took similar terminals from a donor device and modified them to make my unit work. I then searched Klein's website, and all of the internet for a replacement power cartridge and even called Klein customer service, but the item is not available separately and nowhere could I find it online. The unit worked after fixing it. But if this happened to someone not as tech savvy as myself, it wouldn't be the same case. So I am disappointed that Amazon did not or does not inspect their "used" items before listing them for resale. Overall Klein is a great company and great tools. For the 15$ I saved by buying a used device, I'd have purchased brand new if I had known this beforehand. How or why the terminals were not in cartridge is a mystery, but someone attempted to install batteries into the unit which should've been a dead give away when the batteries were not clicking in. So I feel a bit deceived by Amazon over this. ... show more
Reviewed in the United States on February 26, 2021 by Joseph Thomas

Can't find a product?

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