Independent, not-for-profit product safety testing and certification organization. Testing products for public safety for more than a century.Underwriters Laboratories Inc. About UL | Contact Us Go directly to a UL Service: Alarm Finder Alarm Services Anticounterfeiting Operations Architectural Services Appliances Audio/Video Related Products CB Scheme Change Billing / PO Information China Market Access Commercial Inspection and Testing Services Components Program Connecting Hardware Contractor Programs Customer Service Data Acceptance Program Decorative Lighting Strings DENAN PSE Services for