Hanna Instruments HI 2550 - Manual (Page 43)

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• Submerse 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 memorize
calibration and restart in 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.