I have two angle corrected laser range finders they both agree using the angle corrected mode that the distance from the base of the tree to the target is right. I have never missed a shot using this system and I have been bow hunting since 1949 my dad was Boyer[made long bows] I started building my own when I was 12 years old.I took my first deer in 1957 and believe me they were had to find that was the first year they opened the season in IL.