Bow Force Mapper: Measures and displays peak weight & holding weight, calculates the stored energy and the power stroke of a bow, measures and records the complete bow draw force curve, downloads all information and complete force curve to the Easton Arrow Chronograph for printing, advanced arrow selection, and PC download. Arrow Chronograph and Shaft Selector: Downloads and prints the bow draw force curve from the Bow Force Mapper, measures and displays the details of a bow set up. Prints: draw force curve, cam type, specific arrow selection recommendations and arrow drop table.