Combustible Gas Leak DetectorPerfect for homeowners, professionals or real estate agents, the propane gas alarm triggers when a propane gas leak is sensed. Suitable for methane, natural gas, propane, butane, ethane, gas, gas oil, gasoline, toluene, sewer gas, alcohol, ketones, carbon monoxide, etc. Detects gases between 50 and 10,000 parts per million (ppm). Audio and visual alarms, the gas sniffer employs visual and audible alarms with detection as fast as 0.5 seconds. It triggers red lights and voice alarms and loud sounds to let you know if there are high concentrations of potentially harmful gases in your environment. High and low sensitivity, the adjustable sensitivity dial makes pinpointing leaks easier because you can start with a high sensitivity level and work your way down until you pinpoint where the leak is. Compact design, portable pen design, weighing only 1.69 ounces, small and light, easy to carry and operate. The radon detector comes with 2 AAA alkaline batteries so you can set up the detector and have it ready as soon as you receive it. Warm-up takes only about 30 seconds. 10 minutes without operation or gas detection automatic shutdown