Hanna Instruments HI 98186 - Manual (Page 52)

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• Use the ARROW keys to set the calibration point values to that of the ice
and water mixture, measured by the reference thermometer.
• When the reading is stable and close to the selected calibration point, the
CFM functional key is displayed.
• Press CFM to confirm.
• The second expected calibration point is displayed.
• Immerse the DO probe into the second vessel as close as possible to the
reference thermometer.
• Allow a few seconds for the probe to stabilize.
• Use the ARROW key to set the calibration point value to that measured
by the reference thermometer.