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300 I Residential and Commercial Combustion Analyzer Kit with Bluetooth Printer I CO Meter for Flue Gas, Draft, Differential Pressure and Ambient CO Levels of Heating Systems Style:Set With Printer 4 5 15R HG hospital300 I Residential and Commercial Combustion Analyzer Kit With Bluetooth Printer I CO Meter for Flue Gas, Draft, Differential Pressure And Ambient CO Levels of Heating Systems Efficient: The combustion testing tool reliably measures the carbon monoxide and O2 level of furnaces and boilers, as well as temperature, draft and differential pressure Durable: The flue gas meter is equipped with an extremely sensitive CO and O2 sensor with up to 6 years of