In-Situ smarTROLL Multiparameter Handheld Operators Manual - Manual (Page 45)

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Do not perform a "Zero in Air" calibration if a Depth reference is
already set because it will result in a faulty calibration. To clear a
Depth reference, tap Restore Defaults.
4. Ensure that the pressure sensor is exposed to air and is not submerged in liquid.
5. Tap the Start button.
6. When the calibration is stable, tap the Accept button.
Setting the Depth Reference
1. Tap the Calibration icon to access a list of sensors that are available for
calibration.
2. Tap Depth Sensor.
3. Tap Depth Reference.