In-Situ smarTROLL Multiparameter Handheld Operators Manual - Manual (Page 50)

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Calibrate the ORP Sensor
1. Tap the Calibration icon to access a list of sensors that are available for
calibration.
2. Tap ORP Sensor.
3. Tap 1-Point Calibration
4. Make sure the vented cap is installed on the calibration cup. Fill the cup to the fill
line with calibration standard. Place the instrument into the calibration cup, and tap
Start.