E Instruments E500 [E500-1] Combustion Analyzer with O2, CO, CO2, Combustion Efficiency

E Instruments E500-1 Combustion Analyzer with O2, CO, CO2, Combustion Efficiency. Maximize Combustion Efficiency of Residential and Light-Commercial Boilers, Water Heaters and Furnaces. E500 - LITE = Combustion Analyzer with O2, CO, CO2, Combustion Efficiency, Heat Losses, Draft, Pressure, Excess Air, Temperature. NO Bluetooth, No Smartphone Apps