If LCD can't be turned on:
Pressing "POWER" button again.
Check battery or replace it if necessary. (Determine if there is an insulator blocking
the battery power)
If Distance measurement is abnormal:
Please confirm whether the lens have dirt.
Please make sure that the mark circle overlap your target.
It can be turned on, but the data will not be displayed:
Low battery voltage, please change the battery.
Out of measurement range or less than 5 yards.
Change the measurement target.
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