Hanna Instruments HI 3512 - Manual (Page 60)

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• Use the ARROW keys to set the calibration point value to that of the
hot water.
• When the reading is stable and close to the selected calibration
point, Confirm function key is displayed.
• Press Confirm to confirm. The instrument returns to the calibration
screen.
Note: Use ARROW keys to change calibration point if necessary
(±10.0 ºC) around the point.
If the reading is not close to the selected calibration point, “Wrong”
message will blink. Change the temperature probe and restart calibration.