Combustion Analyzer Kit, InTech Residential, Fuel Type 5 Pre-Programmed Fuels Options, Natural Gas, Oil #2, Oil #6, Kerosene, B5, And Propane/LPG, Combustion Efficiency 0.1 to 100 Percent, Oxygen Concentration 0.0 Percent to 20.9 Percent, Carbon Dioxide Concentration 0.1 To A Fuel Dependent Maximum (in Percent), Carbon Monoxide Measurement Range 0 to 2000 ppm, Primary/Ambient Air Temp. -4 Degrees to 212 Degrees F, Stack Temp. -4 Degrees to 1202 Degrees F, Excess Air 0 to 250 Percent