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Brochure Fast Easy Furnace TuningMeasures flue temp and %O2 Calculates %CO2 %EA and combustion efficiency Hands-free testing with magnet R-cone and automatic pump Programmable for custom fuel typesThe 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 %O2 and flue temperature and calculates %CO2 %Excess Air and combustion efficiency. Like all Fieldpiece products the SOX3 Combustion Check Tool was designed to help HVACR professionals do more with their tools.