ASTM Yo-Yo Ball Length Tester GT-MB19B
ASTM YO-Yo Ball Tester used for measure the length of YO-YO ball under the 80rpm rotary speed, to determine whether the YOYO ball of the elastic ropes have the hazard of neck injury.
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standardASTM F963 section4.37, 8.24-2017
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certificateISO 9001, UKAS, CE