UL is the abbreviation of Underwriter Laboratories Inc. UL is the most authoritative safety testing laboratory in the United States and the largest private institution in the world engaged in safety testing and appraisal. It is an independent, non-profit, professional organization that conducts tests for public safety. Unlike FCC certification, UL certification is a safety certification. UL is mainly engaged in product safety certification and business safety certification. Its ultimate goal is to provide the market with products with a considerable safety level and contribute to ensuring personal health and property safety. In the United States, for consumers, UL is a symbol of safety. Globally, UL is one of the most trusted qualified assessment providers for manufacturers.