I found out about these measuring wheels from the guy who identified the four corners on a 10-acre lot I purchased in the high desert. Okay, I'm a woman and I'd never seen these before! I bought the Keson RR318N because of its ratings and the great price on Amazon. I've been using it to layout a "homestead" on the land and I think it's really a neat contraption! The wheel glides easily over the terrain and is comfortable to use. The numbers are easy to read and it makes measuring a cinch. It actually took me three full days to figure out where to put the house, but that had nothing to do with the Keson wheel! I will find many uses for this over the years. I recommend this quality product wholeheartedly.