E Instruments BTU900-CP Combustion Analyzer CxHy Kit is the updated BTU900 high-efficiency combustion analyzer that is a combustion efficiency meter (O2, CO, CO2, CxHy & Printer , excess air, efficiency) as well as a carbon monoxide (CO) leak detector, a differential pressure manometer, draft meter, and thermometer. E Instruments BTU900-CP also features unbreakable metal hose connections, PC software with auto-saving features, and now is designed with Bluetooth communication for use with an optional Bluetooth printer for instant on-the-job test results.