The ability to not just jump but jump high is crucial to the success of any volleyball player. The Tandem Sport Vertical Challenger helps you get a jump on the competition. This volleyball trainer is the most accurate vertical test on the market for measuring all types of vertical jumping abilities from the standing to the two-step jump. This pole ranges from 4 to 12 feet and contains moveable arms placed at 1” increments for an accurate measurement every time.It comes with a reset pole to provide a quick restart rate. Players around the world will find themselves reaching new heights after using the Tandem Sport Vertical Challenger.