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

Excellent product. It quickly and accurately helped me locate a natural gas leak in my attic coming from my water heater. I called a plumber and this one actually worked better than the one he was using. Make sure you read the instructions (important to note it has like a 50 second calibration period when you turn it on). Highly recommended.

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.

Bought this to test some connections around the house that were done by a tech. Happened to be passing by my furnace so I figured I’d check the main connections just in case. This unit found a leak immediately that I could not smell or hear.

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.

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.

I did not use the one I purchased. By the time it arrivedI 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

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.

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.