Perform measurement again.
Contact your dealer
Data transfer error
Connect device and repeat procedure
Temperature too high
Let device cool down.
Temperature too low
Warm device up.
Received signal too weak, measuring time too long
Change target surface (e.g. white paper).
Received signal too high
Change target surface (e.g. white paper) .
Too much background light
Shadow target area.
* If other message codes are displayed frequently even the instrument has been switched off and on, please contact your dealer.