... and alarming point can be adjusted BX Series Single Gas Detector has high sensitivity and high accrancy, it is suitable for ... (CO, H2S, SO2, CL2, NO, CLO2, NO2<60s), (HCN, NH3, O3,HCl, C2H4O <160s), (PH3<100s), (combustible gas <30s) Detection error ... calibrating cap to facilitate calibration by users Single Portable Gas Detector