84 Pcs Pressure Testing Caps Test Probe Tc-3 for Sharp Edge Tester Testing Meter Set-50 Ul1439 Put the test head on the test head of the tester; after putting the pressure test head on the edge to be tested, immediately use a force of 0.68KG to move 2 inches along the edge to be tested, and then return to the starting point, the total moving distance is 4 inches; after the test, check the test head, if the outermost two layers (simulated skin) on the test head are scratched, it indicates that the test edge is a sharp edge for testing electrical products, various children's toys, including computers On products such as home appliances and electronic equipment, whether there are sharp edges that endanger the safety of users in accessible positions is for safety testing purposes. Colour:As Shown Material:plastic Package Contents: 84 x Ul1439 Pressure Testing Probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.