Portable Gas Detector, Combustible Gas Alarm, Breath Alcohol Tester manufacturer / supplier in China, offering Intrinsically Safe Portable Methane Gas Leak Detector with Built-in Pump, Portable Ethane Identifier Handheld Ethane C2h6 Gas Alarming Device Gas Leak Detector, Portable Single Gas Detector with Smart Sensor Module (E1000) and so on.