Visionking Binoculars 8x42 Binocular for Laser Range Finder Binoculars Scope 1800 m Distance Telescope Watching Bird Measurement range: 5---1800m Error in measurement: + 1m +0.1% The pattern of measurement display: Inner-vision-field LCD display Effective objective lens aperture: 42 mm,File coating: multiple file coating This model is very duarable,and be able to rapidly and accurately measure the range of the target by emitting invisible,eye safe,and infrared energy pulses