1. 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 for home use as well as for kindergartens or primary school playgrounds and adds fun to their physical activities. 2. Improve training and foster resistance: the vertical jump tester is a valuable tool to help children improve their vertical jump, improve their physical 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. Convenient measurement and adjustable height: with a length of 25 cm, the vertical jump tester has corresponding markers for each centimetre, so that the vertical jumps can measure accurately. In addition, the installation height is adjustable, which is suitable for children of different ages and ensures suitability for different skills.