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UL是美國保險商實驗室（Underwriter Laboratories Inc.）的簡寫。UL 是全球優秀的獨立安全科學公司，并擁有逾 118 年的歷史。UL 在 100 多個國家雇傭超過 9000 名專業人士，并擁有五個獨立的業務部門－產品安全部、環境部、生命及健康部、知識服務部和驗證服務部－以滿足我們客戶不斷擴大的需求及履行我們的公共安全使命。
UL是一家全球性的獨立的從事安全科學事業的公司，在創新性安全解決方案領域，擁有逾一個世紀的專業知識，從公眾用電到具有突破性的可再生新興能源及納米技術，UL涵蓋各學科的方方面面。UL致力于為公眾創造更安全的生活與工作環境，保障公眾、產品及場所的安全，從而推動全球貿易，為公眾提供安心。

UL提供認證、檢驗、測試、驗貨、審核，咨詢和培訓等服務，我們的知識與專長能夠幫助客戶從容應對日趨復雜的供應鏈難題 － 從法律法規，到貿易挑戰和市場準入。

我們五大獨特的業務單元 — 產品安全、檢測服務、生命及醫療健康科學、培訓咨詢服務及綠色環保認證，致力于不斷延伸專業領域及服務范圍，進而在瞬息萬變的市場環境中，提供安全領域的整體解決方案。
          
UL (Underwriters Laboratories) is a safety consulting and certification company headquartered in Northbrook, Illinois. It maintains offices in 46 countries. UL was established in 1894 and has participated in the safety analysis of many of the last century's new technologies, most notably the public adoption of electricity and the drafting of safety standards for electrical devices and components.[citation needed]
UL provides safety-related certification, validation, testing, inspection, auditing, advising and training services to a wide range of clients, including manufacturers, retailers, policymakers, regulators, service companies, and consumers.
UL is one of several companies approved to perform safety testing by the US federal agency Occupational Safety and Health Administration (OSHA). OSHA maintains a list of approved testing laboratories, which are known as Nationally Recognized Testing Laboratories.