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Heavy-duty base with easy glide casters. Moveable metal arms are placed at 1 in. increments. Highest arm reached remains angled for precise jump reading. Telescoped reset pole quickly restores metal arm position. Measures person’s height standing arm reach standing vertical or vertical jump with approach. The Tandem Sport Vertical Challenger features moveable metal arms and a heavy duty base with easy glide casters. The telescoped reset pole restores the metal arm position quickly so you can keep perfecting your vertical jump. The challenger measures the person’s height and standing arm reach and the highest arm reached remains angled for precise jump reading every time.