Usage: This testing machine is used to test the rebound height of a tennis ball. Technical Specification: Drop height: 2540mm Test speed drops 8 balls per minute Transmission ball method: motor transmission Volume (WxDxH): Host: 50x75×285cm Control box: 30×30×115cm Weight: 170kg Power supply: 1∮, AC220V, 50/60Hz (according to country or designation)