Hanna Instruments HI93501 Instruction Manual page 10

CALIBRATION CHECK ERROR MESSAGE
If during CALIBRATION CHECK the meter display more than
±0.3 °C, then a "Err" message is dispayed .
Contact your dealer or your nearest Hanna Service Center for
recalibration.
DAMAGED PROBE message
When the readings are very far from the reading range, the
probe can be damaged, "NO PROBE" message is
displayed (see WARNING MESSAGES section).
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