Combustible Gas Detector Detects Propane methane natural gas gasoline fuel oil CH4 (methane) H2 (hydrogen) Iso-butane Ethanol Ethylene Tetrachloroethylene Dimethyl sulfide Toluene Folmaldehyde Dietyl-ether Ethyl-acetate Dochloromethane NH3 (ammonia) R-22 Audible Visual Indicator