1.Comfortable measurement and adjustable height: With a length of 25 cm, the vertical jump tester has corresponding markers for every centimeter, so that vertical jumps can be measured accurately. In addition, the installation height is adjustable, which is suitable for children of different age groups and ensures suitability for different abilities. 2.Improvement of training and fostering resilience: The vertical jump tester is a valuable tool to help children improve their vertical jump, enhance their physical fitness, 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, built from stable ABS material, is designed for regular use without being easily damaged. The design includes a reset lever for the markers, 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 elementary school playgrounds, adding fun to their physical activities.