Carefully remove the tape without enlarging the cut size and measure the cut length with a steel ruler. If the cut length exceeds 0.5in (12.5mm) the test edge end is a sharp edge Sharp edge tester: The sharp edge tester is used to test whether the sharp edges that can be touched on the toy are harmful to safe, which belongs to the toy safe test The angle between the tester and the test edge is 90°±5°. The point of contact between the end of the test piece and the adhesive paper should be approximately in the middle of the adhesive paper's alignment Roll a loop of TFE tape over the sharp edge tester heads with no more than 0.1in (0.25mm) overlap. Fix the sample in such a way that the end of the tested edge does not move or bend Service: We are very sorry for the shopping experience you have experienced. If you have any problems with the goods you received, please contact us and we will serve you 24 hours a day.