... Carbon monoxide 4.Sulfured hydrogen CD4 Portable Multi-parameter DetectorApplicationIt is a new generation of intelligent multi-parameter detector ... in special environment such as methane, oxygen, carbon monoxide, sulfured hydrogen, temperature, and humidity.Main ... specificationsItemSpecificationMethane(0 - 4 )%Oxygen(0~25)%Carbon monoxide(0~1000)ppmSulfured hydrogen(0~100)ppmTemperature(-20 ...