When you turn on the rangefinder, the PiP window turns off.
Additional Information:
The accuracy and distance of the measurement depends on the reflection 
coefficient of the object surface and weather conditions. The reflection 
coefficient depends on the texture, color, size and shape of the object. Generally, 
lighter colored objects and those with a shiny surface will have a higher reflection 
coefficient.
Measurement accuracy can be influenced by the light conditions, fog, haze, rain, 
snow, etc. The results may be less accurate when operating in sunny weather or if 
the rangefinder is directed towards the sun.
It is easier and more reliable to measure the distance to large objects than to 
small ones.