Testo 310 Residential Combustion Analyzer.

The unit powers on normally and completes its startup sequence. During testing, the oxygen (O₂) reading does not display a value and previously showed error code E04, indicating an issue with the O₂ sensor.

The CO sensor displays readings, and the screen, buttons, and internal pump appear to function as expected.

Due to the missing O₂ readings, this unit may require sensor service and professional recalibration depending on the buyer’s intended use.

Item is sold as shown in the photos. Please review all images carefully and ask any questions before purchasing.

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