I got false readings with mine till I learned how to use them. The false reading comes from the user not the range finder. Few people can hold one steady enough to range out beyond 200 yards, you need a rest of some type. I use my shooting sticks or a tripod. Your wiggling around where you cross a branch or a bunch of grass that is closer than what you think you are ranging, will give you the range to the branch or the grass. That is not a false reading, it's correct, just the wrong item being read because of the user, not the Range finder.
Reminds me of something I read, I believe here on Graybeard. A guy was trying to range something, and kept getting a reading of three feet. he was getting upset with the range finder, because it would not give him the proper range. finally when he was reaching his top frustration level, his Grand Son in the back seat quitely said, "Grandpa, roll down the window". OOOPS!
Some of us are technologically challenged.