i had some geovids with range finder built in.i also have a gun tuff range finder
which ranges from 10 to 400 yards very very accurately.i had no idea how accurate it was untill i got my geovids.i took them out together one day to compare them.the results very unbelieveable.there was onlt +/- 1 yard in them at ranges out to 150 yards.dont get me wrong quality is miles apart but for a cheap range finder the gun tuff can't be beat at the price.i sold the geovids as they were far too heavy.i do miss the quality optics though.