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Yo-yo Balls Tester Toys TestingYo-yo Balls Tester is to measure the initial length and elastic constant of the Yo-Yo ball. Includes steel ruler,... Read More |
Yo-yo Balls Tester Toys TestingYo-yo Balls Tester is to measure the initial length and elastic constant of the Yo-Yo ball. Includes steel ruler,... Read More |