Newcon Optik LRM 2000PRO, Руководство по эксплуатации

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8. TROUBLESHOOTING
The 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 8 seconds, and press the Action button again.
Compass shows zero at any direction.
Wait for 8 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.