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Flue gas SO2 replacement sensor (0-5000 ppm range, 1 ppm resolution) compatible with Testo 340 and Testo 350 combustion and emissions analyzers. This sensor is to be used on analyzers that are already measuring SO2.
To add an SO2 sensor to a unit that has not measured it before, use the Testo 0554 2250 upgrade sensor module.