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 and 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, various 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 Note: The package includes only the items listed above. Other products are not included. Note: Lighting effects and monitor settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.