1.Easy installation: the vertical jump tester is equipped with a strong wall mounted suction cup and a powerful doublesided foam adhesive and is easy to install on multiple surfaces such as glass, tiles, boards or walls.This versatility allows its use in a variety of settings and environments, ensuring convenience. 2.Improve training and foster resistance: the vertical jump tester is a valuable tool to help children improve their vertical jump, improve their physical condition and motivate them to challenge themselves. It not only helps in physical training, but also promotes a resilient mindset and the desire for selfimprovement. 3.Material and reset mechanism: the vertical jump tester, which is built of sturdy ABS material, is built to be used regularly without being easily damaged. The design includes a reset lever for the markings, which is quickly and conveniently reset after each jump to ensure accurate measurements. 4.Childfriendly design: the vertical jump tester with a cute and appealing duck shape is especially suitable for younger children (over three years old). Its adorable design makes it perfect for home use as well as for kindergartens or primary school playgrounds and adds fun to their physical activities.