Know exactly how high your vertical jump reaches when you use the Tandem (R) Vertical Challenger. This challenger telescopes from 4' to 12' to provide measurements to players of all different skill levels. After you jump, the highest arm that is reached remains in place until the measurement is recorded. The heavy-duty base is designed with easy glide casters for stability and durability. FEATURES: Designed to measure the height of your vertical jump The heavy-duty base is made with easy glide casters for stability and portability Arms are fully movable and placed at 1" increments for accurate measurements The highest arm that is reached remains angled until the height is measured Comes with a handy reset pole Dimensions: telescopes from 4' to 12' Manufacturer's warranty: 1-year For additional information relating to the Manufacturer's Warranty, please contact 1-800-766-1098.