... certification. (2)Colorimetric gas detector tube can detect the concentration of various gases rapidly without ... . (4)It can detect different toxic gases in the air including CO,CO2,H2O,H2S,NH3, ... PH3,SO2,C4H10,CH3Br,C2H3CL, CL2, HCN,HCL,HF,NO,NO2over 600 types of target gas can ... be measured. For product Details, please contact us at any time. Colorimetric Gas Detection Tubes (20 In ...