E Instruments BTU 1100-2 Combustion Analyzer SMOKE/OIL Kit is designed to maximum your combustion efficiency, easily set-up, install, and properly service any residential and/or light commercial boilers and burners. E Instruments BTU 1100-2 Combustion Analyzer measure, display and print combustion efficiency, O2, CO, CO2, along with ALL of the necessary temperature, draft, and pressure measurements. Made in Italy.

E Instruments BTU4400-S Combustion Analyzer is a hand-held commercial and industrial gas analyzer. Very valuable tool that is designed for emissions monitoring, maintenance and tuning of combustion processes including such as: boilers, kilns, gas and diesel engines, heaters, furnaces, turbines, burners, and laboratory analysis. If the need to replace a sensor occurs, don't fret, sensors are field-replaceable and new ones are already pre-calibrated! The BTU4400-S comes with the O2,  CO, CO2, NO/NOx and SO2 sensors.

E Instruments BTU4400-N Combustion Analyzer is a hand-held commercial and industrial gas analyzer. Very valuable tool that is designed for emissions monitoring, maintenance and tuning of combustion processes including such as: boilers, kilns, gas and diesel engines, heaters, furnaces, turbines, burners, and laboratory analysis. If the need to replace a sensor occurs, don't fret, sensors are field-replaceable and new ones are already pre-calibrated! The BTU4400-N comes with the O2,  CO, CO2, NO/NOx and NO2 sensors for the "True-NOx" analyzer (NO + NO2).

E Instruments BTU4400-3 Combustion Analyzer is a hand-held commercial and industrial gas analyzer. Very valuable tool that is designed for emissions monitoring, maintenance and tuning of combustion processes including such as: boilers, kilns, gas and diesel engines, heaters, furnaces, turbines, burners, and laboratory analysis. If the need to replace a sensor occurs, don't fret, sensors are field-replaceable and new ones are already pre-calibrated! The BTU4400-3 comes with the O2,  CO, CO2 and NO/NOx sensors and ability to be upgraded to NO2 or SO2 sensor.

E Instruments BTU4400-2 Combustion Analyzer is a hand-held commercial and industrial gas analyzer. Very valuable tool that is designed for emissions monitoring, maintenance and tuning of combustion processes including such as: boilers, kilns, gas and diesel engines, heaters, furnaces, turbines, burners, and laboratory analysis. If the need to replace a sensor occurs, don't fret, sensors are field-replaceable and new ones are already pre-calibrated! The BTU4400-2 comes with O2, CO, and CO2 sensors with the ability to be upgraded to NO/NOx and to NO2 or SO2 sensors.