Combustion Analyzer Digital Electronic Fuel Type Bio Heat 5 Fuel Oil #2 Natural Gas Propane Wood Oxygen Concentration 0 to 21 Percent Carbon Dioxide Concentration 0 to CO2 max Calculated Primary/Ambient Air Temp -4 Degrees to 212 Degrees F (20 Degrees to 100 Degrees C) Stack Temp -40 Degrees to 2192 Degrees F Pressure/Draft -10 to +40 in WC - Draft -40 to +80 in WC - Pressure Excess Air 0 - 100 Percent Calculated Display Large 5 in Smart-Touch HD