Combution Analyzer Residential/Commercial Fuel Type Bio Oil Butane Heavy Oil Light Oil LPG Natural Gas Pellets Propane Combustion Efficiency 0 to 99.9 Percent Oxygen Concentration 0 to 21 Percent Carbon Dioxide Concentration 0 to 21 Percent Carbon Monoxide Measurement Range 0 to 2000 ppm Primary/Ambient Air Temp 32 Degrees to 113 Degrees F Pressure/Draft -32 to +32 in WC -80 to +80 mBar Excess Air 0 to 119.9 Percent Display Backlit Display Battery Type AA Rechargeable