Labs (MET) (formerly MET Laboratories, Inc.) Nemko USA, Nemko North America, Inc.(NNA) NSF International (NSF) QAI Laboratories, LTD (QAI) QPS Evaluation Services, Inc (QPS) SGS U.S. Testing Company, Inc. (SGSUS) (formerly UST-CA) Solar PTL, LLC Southwest Research Institute (SWRI) TUV Rheinland of North America (TÜV) TUV SUD America (TÜVAM) TUV SUD Product Services GmbH (TÜVPSG) Underwriters Laboratories Inc. (UL) References Occupational Safety and Health Administration United States science-related lists Product-testing organizations