The UniqueTek Loaded Round Counter is a device that counts the number of cartridges that have been loaded sucessfully. A sensor is attached on top of the crimp die on your reloading machine, and the number of completed rounds is displayed on the display unit, mounted on the Magazine Shield Tube ofthe priming system. Installation is a simple process, described in the included Installation Instructions. The Loaded Round Counter can be used on Dillon reloading machines, using a separate crimp die (with a hole in the top).