Newcon Optik NEWCON LRM1500SPD - Manual (Page 19)

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7. TROUBLESHOOTING
The ranging does not work. The display is transparent.
Check the charge of the battery. Replace it if it is weak.
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.