gas detector (O2 H2S CO CH4) 1.Methane 2.Oxygen 3.Carbon monoxide 4.Sulfured hydrogen CD4 Portable Multi-parameter ... hydrogen, temperature, and humidity.Main specifications: ItemSpecificationMethane(0 - 4 )%Oxygen(0~25)%Carbon monoxide(0~1000)ppmSulfured hydrogen(0 ... >15hExplosion protectionExibd IProtection gradeIP54Dimensions240×170×120mmWeight0.3Kg Multi-Gas Detector,4 Gas-CO,O2,H2S,CH4