This Vertical Challenger, manufacturered by Tandem Sport, is listed with an MPN of TSVERTICAL. et a jump on the competition with the most affordable and accurate device on the market for measuring vertical jump! Telescopes from 4 to 12 feet. Moveable arms placed at 1 increments allow for accurate jump measurement. Highest arm reached remains angled until jump reading is measured. The heavy duty base is fitted with easy glide casters providing both stability and portability. Vertical Challenger comes with handy reset pole.