The New S6000-6DSH industrial HVAC gas analyzer measures Measure Oxygen O2 (0-25%), CO (0-8000ppm), NO/NOx (0-5000ppm), NO2 (0-1000ppm), SO2 (0-5000ppm) and Hydrogen Sulfide H2S (0-500ppm) Gas Sensors calculation and Carbon Dioxide (CO2). Display and print combustion efficiency, along with ALL of the necessary temperature, draft, and pressure measurements.