In-Situ smarTROLL Multiparameter Handheld Operators Manual - Manual (Page 47)

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A depth reference applies an offset equal to the distance from the
pressure sensor to a desired location, such as the bottom of the
probe, so that the depth reading is reported from the desired
location, rather than from the location of the pressure sensor.
1 Pressure sensor
2 Example of a Depth reference setting
6. When the calibration is stable, tap the Accept button.
Calibrate the pH Sensor
1. Tap the Calibration icon to access a list of sensors that are available for
calibration.
2. Tap pH Sensor.
3. Select the method by which to calibrate the sensor. This example demonstrates a
two-point calibration. Tap 2-Point Calibration.