Combustion Analyzer, Digital Display Screen Type LCD with Backlight, Maximum Carbon Monoxide Measured 10,000 ppm, Maximum Oxygen Measured 21 Percent v/v, Minimum Oxygen Measured 0 Percent v/v, Selectable Fuel Options Bio Fuel, Bio Oil, Butane, Coke, Light Oil, LPG, Natural Gas, Propane, Town Gas, Wood Pellets, Minimum Carbon Monoxide Measured 0 ppm, Maximum Combustion Efficiency 99.9 Percent, Minimum Combustion Efficiency 0 Percent, Maximum Excess Air Measured 250 Percent