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 perfect for home use as well as for nursery or primary school playgrounds and adds fun to their physical activities. 2. 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. 3. 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. 4. 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 ensures convenience.