Multigas Gas Detection Instruments Please select one of the following; GasAlertMicroClip (O2, H2S, LEL & CO) 1 to 4 Gases GasAlertMicro (O2, H2S, LEL, CO & SO2) 1 to 4 Gases GasAlertMicro 5 (O2, H2S, LEL, CO, PH3, SO2, NO2, HCN, CL2, NH3, CLO2 & O3) 1 to 5 Gases GasAlertMicro 5  PID (O2, H2S, LEL, CO, PH3, SO2, NO2, HCN, CL2, NH3, CLO2 , O3 & Volatile Organic Compounds) 1 to 5 Gases GasAlertMicro 5 IR (O2, H2S, LEL, CO, PH3, SO2, NO2, HCN, CL2, NH3, CLO2, O3 and CO2) 1 to 5 Gases     Home