As far as in the field, it just works. If Im out on my tractor "hand held" I get yardage off any critter I've seen so far. On a tripod you can range the smallest targets easily. I used a Leica Geovid 2500 yard range finder for a couple of years at work and while these don't quite have Leica optics the range finder is as good or better and a lot easier to carry in the field