Product Review

The SOX3 combustion check is a great tool to easily Tune furnaces when a full combustion analysis isn't necessary. Designed specifically for hvacr pros, the SOX3 provides all the essential measurements needed to Tune most combustion equipment. It directly measures percent O2 and flue temperature, and calculates percent CO2, percent excess air, and combustion efficiency. made in United States. Manufactured by Fieldpiece instruments Inc.