21 Pcs Pressure Testing Caps Test Probe Tc-3 for Sharp Edge Tester Testing Meter Set-50 Ul1439 NEW Place the test head on the tester; after positioning the pressure test head on the edge to be tested, apply a force of 0.68 kg to move 2 inches along the edge, then return to the starting point, resulting in a total travel distance of 4 inches. After testing, inspect the test head. If the outermost two layers (simulated skin) are scratched, the tested edge is considered a sharp edge. This test is used for electrical products, children's toys, computers, home appliances, and electronic equipment to determine if accessible edges pose a safety hazard. Color: As Shown Material: Plastic Package Contents: 21 x Ul1439 Pressure Testing Probe Only the above package content is included; other items are not included. Note: Due to light reflection and display differences, the color in the image may vary slightly from the actual product. Measurement error allowance is +/- 1-3 cm.