Nikon Coolshot 20 Laser Laser Rangefinder Measurement range * 1 5 ~ 500m / 6 ~ 550yds.Magnification (times) 6 Objective lens effective diameter (mm) 20 (Length  width  height) size (mm) 91  37  73Mass (weight) (g) (I except the battery) about 125 Waterproof standard Life waterproof structure * JIS / IEC protection class 4 (IPX4) equivalent (based on our test conditions).