Hey Arthur, that is one cool device! Every bow shop I've ever been in, has a crony to measure speed, but none have ever had anything to measure force. I could see a company marketing something like this with a range on it to use as a guide to determine if your arrow had the force for killing particular animals. Plus is would be so easy to shoot at whatever distance you were hunting at. Talk about a device that would be a whole lot more useful than a crony!