【Sharp Edge Tester】in accordance with UL1439D standard requirements, it includes test caps (21 PCS) to test whether the sharp edges of electrical products such as computers, daily household appliances and electronic devices are dangerous to users in touchable locations. 【High Quality】The instrument is manufactured according to the relevant standard UL1439, using high-quality materials and correct dimensions. Used for safety testing. Can be used to determine whether there is a risk of scratching fingers. 【Press Down Test】Place the test cap on the edge of the object to be tested, use 0.68KG force to move 2 inches along the edge to be tested, and then return 2 inches to the starting point, a total of 4 inches. 【Note】If the outer two layers (simulating skin) on the test cap are scratched, it means that the test edge is a sharp edge. If the outer layer of the test rubber cap is intact, it is not a sharp edge. 【Widely Used】It can be used to detect whether there are sharp edges that endanger the safety of users in accessible positions on electrical products, various children's toys, including computers, daily household electronic equipment, etc.