gas monitor (O2 H2S CO CH4 Temperature Humidity) 1.Methane 2.Oxygen 3.Carbon monoxide 4. ... alarm, a detector serves several purposes, small and light, and convenient to adjust and use. It can be widely used for continuously ... environment such as methane, oxygen, carbon monoxide, sulfured hydrogen, temperature, and humidity.Main specifications ItemSpecificationMethane(0 - 4 )%Oxygen(0~25)%Carbon ...