I use Bushnell Bowhunter. Works great for $160 http://www.amazon.com/Bushnell-BowH...8&qid=1358137820&sr=8-2&keywords=range+finder
What's it called and is it available for Android? I don't mind testing it out I downloaded an app called "Deer Range Finder" from the Google Play Store for my phone. I compared it to my buddy's Bushnell laser range finder. The only problem was the feet measured in the app, which was 138 feet (41 yards) was 3' off the yardage from the laser range finder, which said 141.5 yards. I think if you use the feet measurement instead of the yards, the app will work in a pinch. I think I'll definately look into a range finder before the start of the season