For simultaneous analysis and alarm of up to four of any combination of O₂ deficiency, CO₂, SO₂, NO, NO₂, H₂, CO, CL₂, NH₃, H₂S, % RH, and temperature of ambient air.

Designed to monitor ambient hydrogen sulfide (H2S) near industrial processes such as biogas & syngas production, landfills, in confined spaces, or any other area where H2S may be present.