The Sharp Edge Tester is used to examining toys in normal use and after reasonable abuse whether exist or produce the danger of cut, belongs to the Toys safety Test Item. The metal shell is durable. The king-size feet make operation more convenient. The special photoelectric sensor indicates force value function, to assure the test force fix in 1.35 pounds when testing. Avoiding the indicatory produces error due to the different perspectives. Power supply: 220AC/50Hz, built-in rechargeable batteries.