Got one of these a few months back and I thought I would share it with you. For those of you who constantly like to know how fast your bow is shooting this little chrono is a great tool to have. You can easily check the speed of your bow by attaching the rod with the chrono on top into your front stabilizer bushing. Then fire an arrow and a digital read out of your speed appears on the screen. Shure beats having to set up on of those shoot through type chronos and does not take up any space at all. Plus you can take it with you to let a buddy use or whatever. Easily see how much speed you gain/loose from swithching to one arrow to another, adjusting your draw weight, ect. It is a great little handy tool. Priced right too.