In-Situ smarTROLL Multiparameter Handheld Operators Manual - Manual (Page 39)

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8. Rinse the sensors with DI water.
Calibrate the Rugged Dissolved Oxygen Sensor
The RDO sensor requires very little maintenance. The zero oxygen calibration is
optional.
1. Tap the Calibration icon .
2. Tap RDO Sensor.
3. Select the method by which you intend to calibrate the sensor. This example
demonstrates a two-point calibration. Tap 100% and 0% Saturation.