KBA Reach and Jump Vertical Testermeasures vertical jump in 1/2" increments from 1"-45". It'smade of durable molded polystyrene plasticwith ruler increments imprinted on left side and a strip of Velcro for jumpers to place markers to measure jumps. Includes a retriever stick for removing markers. To measure....Reach and place a marker at highest level...then take your best jump and place the second marker. Mounts to any wall...no need for moving or finding storage area! The most affordable verticaljump measuring tool on the market.