Conserve fuel and lower your overall expenses by using combustion analyzers to measure and improve the efficiency of furnaces, boilers, and other HVAC systems. A combustion tester measures the concentration of specific gases such as oxygen, carbon monoxide, nitrous oxide, nitrogen dioxide, and sulfur dioxide. Monitor draft pressure, flue temperature, and air temperature, while calculating parameters such as carbon dioxide, NOx, efficiency, and excess air. Select a combustion tester with internal memory for storing measurement results; download the results to a computer for further analysis. Other models have a built-in printer for immediate printout of results. Perform combustion analysis on multiple fuels such as natural gas, oil, propane, coal, wood, and kerosene.