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Underwriters Laboratories Inc. (UL) is an independent, not-for-profit product safety certification organization that has been testing products for more than 109 years. UL tests more than 18,000 different types of products annually, and more than 17 billion UL Marks appear on products each year. Worldwide, UL's family of companies and its network of – more... service providers include 50 testing and certification facilities. – less – More from ZoomInfo »