Newcon Optik LRB 3000PRO - Manual (Page 24)

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8. TROUBLESHOOTING
Ranging does not work. The display is transparent.
Check the charge of the battery. Replace it if it is weak.
The ranging mode does not work. The display shows results
of the last measurement or is transparent.
Wait for 16 seconds, and press the Action button again.
Compass shows zero at any direction.
Wait for 16 seconds, and press the Action button again. If this
does not help, perform compass calibration.
Black dots are visible on LCD
Liquid Crystal Display may have small black dots, scratches
and other blemishes inherited from the manufacturing
process. These flaws are strictly regulated by number, area
and location and do not degrade the product's measurement
capabilities.
Range measurement cannot be obtained.
 Make sure that neither your hand nor finger is blocking
objective lens, laser emitting lens or receiver lens.
 Hold the unit firmly (avoid hand tremor) while pressing
the Action button.
 Check that the target is within measuring range of the
device and the gating mode does not cut it off.