Hanna Instruments HI 255 - Manual (Page 37)

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• Immerse the temperature probe (or EC probe) in the second vessel as near
as possible to the calibrated thermometer. Allow a few seconds for the
probe to stabilize.
• Use the ARROW keys to set the reading on the secondary LCD to that of
the hot water.
• When the reading is stable and close to the selected
calibration point, “READY” tag will appear and “CFM”
tag will blink.
• Press CFM to confirm. The instrument returns to
measurement mode.
Note: If the reading is not close to the selected calibration point, “WRONG”
tag will blink. Change the temperature probe (or EC probe) and restart
calibration.