Delta OHM HD21ABE, Manual

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6. INSTRUMENT SIGNALS AND FAULTS
The following table lists all error indications and information displayed by the instrument and
supplied to the user in different operating situations:
Display indication Explanation
- - - -
This appears if the sensor relevant to the indicated physical quantity is
not present or is faulty.
OVFL
Overflow appears when the probe detects a value that exceeds the
expected measurement range.
UFL
Underflow appears when the probe detects a lower value than the
expected measurement range.
MEMORY FULL!!
The instrument cannot store further data, the memory space is full.
LOG
It indicates that a logging session is running.