Portable Gas Detector, Combustible Gas Alarm, Breath Alcohol Tester manufacturer / supplier in China, offering High Precision Handheld Multi Gas Detector, Internal Sampling Pump Confined Spaces Gas Monitor, LPG Acetylene and Butane Portable Multi Gas Detector Built-in Sampling Pump (optional), Oxygen and CO2 Multi Gas Detector Handheld 2-in-1 Gas Monitor for CO2 and O2, Resolution of 0.1%Vol and so on.