... , MA Certificate Main Technical Specification(1) Various types of detecting tubes are awarded certificate of quality by quality control and "MA ... ,NH3,PH3,SO2,C4H10,CH3Br,C2H3CL, CL2, HCN,HCL,HF,NO,NO2over 600 types of target gas can be measured. For ... Details, please contact us at any time. Gas Detection Dosimeter Tubes