User’s Guide ________________________________________________ HM40
27
How to Measure
Remove the Transport Protection Cap
Remove the yellow transport protection cap from the
probe when taking the meter into use.
Measure in a Stable Environment
If the measurement conditions are changing, you
cannot get a reliable measurement result. Do not
measure near heat sources, air conditioning, open
doors, or windows.
For best results, leave the meter on in the
measurement area and come back to check it
later.
Avoid Temperature Differences
Temperature differences are a typical cause of error in
humidity measurement and calibration. You must let
the meter stabilize long enough: temperature
differences level out very slowly.
Switch to the Graph view and
wait until the graphs level out,
indicating that the measurement
is now stable.