The CA-6215 measures O2, CO, NO, NO2, NOx, draft pressure, supply air temperature, and stack temperature. These multi-gas combustion analyzers are advanced tools for tuning burners on light commercial and industrial boilers for maximum efficiency, safety and accurate NOx emissions (NO+NO2) for environmental concerns. The CA-6215 Multi-gas Combustion Analyzers provide the basic Series CA-6200 features, which include a heavy-duty gas sampling probe and field upgrade capabilities plus the measurement of NO and NO2 for determination of NOx emissions. The CA-6215 can be field upgraded with gas sensors to measure high-concentration CO, up to 2%, and SO2. The standard heavy-duty gas sampling probe includes an in-line water trap and a unique, long lasting, serviceable filter. Custom length gas sample probe/hose assemblies are available.