There is an object in front of the receiver or emitter lens preventing signal transmission
Solution
Make sure that: the lenses are not blocked by your hand or fingers; the lenses are clean.
Possible cause
The device is not being held steadily when measuring.
Solution
Do not stress the device when measuring.
Possible cause
Distance to the object exceeds 1000 m.
Solution
Pick an object at a distance not longer than 1000m.
Possible cause
Low reflection ratio (for example, tree leaves)
Solution
Pick an object with higher reflection ratio (see point Additional Information in section
Built-In Laser Rangefinder.
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Large measurement error
Possible cause
Inclement weather conditions (rain, mist, snow)