UNI-T UT205A Operating Manual page 22

Model UT205A/206A: OPERATING MANUAL
To obtain precision readings in low-resistance measurement, that is the range of
400.0 , short-circuit the input terminals beforehand, using the relative measurement
function button REL to automatically subtract the value measured when the
testing leads are short-circuited from the reading.
For high-resistance measurement (>1M ), it is normal to take several seconds
to obtain a stable reading.
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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