Review on Propane/Natural Gas Detector: Home Gas Leak Alarm, Tester & Sensor with Sniffer; Monitor Combustible Explosive Gas Level: Methane, Butane, LPG, LNG; Voice/Light Warning, LED Display & eBook by Peter Montoya

I tested it on our gas stove and it worked. I then hung it up in our garage where my wife kept telling me she smelled gas. In the control room we have 2 air handling units, a water heater and a gas water heater. The HVAC guys checked several times and found nothing, but my wife was still concerned. Since installing it, it has never turned off, and my wife has stopped worrying (and bothering me).