Combustion Analyzer Kit, Digital Display Screen Type LCD, Maximum Carbon Monoxide Measured 4,000 ppm, Maximum Oxygen Measured 20.9 Percent v/v, Minimum Oxygen Measured 0 Percent v/v, Selectable Fuel Options B5, Bio Fuel, Butane, Coal, Kerosene, KOKS, LEG, LPG, Natural Gas, Oil 2/4/6, Propane, Wood Chips, Minimum Carbon Monoxide Measured 0 ppm, Maximum Combustion Efficiency 100 Percent, Minimum Combustion Efficiency 0.1 Percent, Maximum Excess Air Measured 250 Percent