China Portable Single Gas Detector factory Portable combustible gas detector GDN-P02 The portable single gas detector GDN-P02 supports to test combustible gas, CO, O2, H2S, H2, NO,NO2, SO2 ,NH3, CL2, O3, HCL ,PH3, CO2 etc gas separately,uses high precision sensor from UK,test gas concentration by natural diffusion. The portable combustible gas detector GDN-P02 is widely is widely used in...