ASTM F963 Yo Yo Ball Length Tester GT-MB19B

Introducing GESTER YO-Yo Ball Tester, a revolutionary device designed to ensure your safety during playtime.
Using advanced technology and adhering to the industry-standard ASTM F963 section 4.37 and 8.24-2017, this tester measures the length of Yo-Yo balls under an 80rpm rotary speed. Why is this important? It helps determine whether Yo-Yo balls with elastic ropes pose a risk of neck injuries. more info: www.gestertest...