Thermo Scientific Scientific AquaSensors DataStick User Manual page 35

Once the sensor has been placed in the second buffer standard and sensor and temperature readings have stabilized,
click the CALIBRATE button to initiate the calibration of the second buffer standard.
While the calibration is in progress the operation can be aborted at any time. The abort will take the system back to normal
measurements using the previous calibration values.
Once the calibration for both points is successful, the displayed sensor value will be based on the new calibration.
Exiting the calibration function will return the display to the measure screen. In this case the measured value of 4.01 pH confirms
that the sensor calibration in 4.01 pH buffer solution was successful.
Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide 33