18103390-1100

TX418 - O2, CO (hydrogen nullifying)

18103390-1145

TX418 - O2, CO (hydrogen nullifying), H2S, SO2

18103390-1612

TX418 - O2, NO2, CO, NO

18103390-1341

TX418 - O2, NH3 (4-electrode), H2S, CO

18103390-1615

TX418 - O2, CO, SO2, NO2