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Device used to measure skin elasticity based on the elastic angle. (A) The user drops the ball by operating a switch, and the ball draws a curve and collides with the subject's cheek on the right side (yellow rectangle: electromagnet switch). (B) A tripod and iPhone SE are installed in front of the device to record the movement of the ball. (C) The schematization for the elastic angle, the maximum angle at which the ball bounces. SE, Special Edition
