UL is short for Underwriter Laboratories Inc. The UL Safety Test Institute is the most authoritative in the United States, and it is also a large non-governmental organization engaged in safety testing and identification in the world. It is an independent, non-profit, professional agency that conducts tests for public safety. Unlike the FCC certification, UL certification is a safety certification. UL is mainly engaged in product safety certification and operating safety certification business. Its ultimate purpose is to obtain products with a fairly safe level for the market, and to contribute to ensuring human health and property safety . In the United States, UL is a symbol of the safety mark for consumers. Globally, UL is one of the most trusted manufacturers of conformity assessment providers.