RSO2 Fieldpiece Field-replaceable Oxygen Sensor for SOX3 - The SOX3 uses an oxygen smart sensor. The icon indicates the approximate life remaining on the sensor and when the indicator is empty, it's time to replace sensor. Techs no longer have to send their instruments in for calibration because the oxygen sensor simply twists in and out.
Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov