The device is not being held steadily when measuring.
Solution
Keep the device steady 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 Laser Rangefinder.
Large measurement error
Possible cause
Inclement weather conditions (rain, mist, snow).