UNI-T UT805 Operating Manual page 28

Note
l
When measuring high resistance (>1M ), it is normal
to take several seconds to obtain a stable reading.
In order to obtain stable reading, choose shorter test
lead to carrying out measurement.
l
The LCD displays OL indicating open-circuit for the
tested resistor or the resistor value is higher than
the maximum range of the Meter.
l
When resistance measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test, and remove the testing
leads away from the input terminals of the Meter.
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Model UT805: OPERATING MANUAL