Signet Testing Laboratories, Inc. (Signet/STL), a Delaware Corporation, is a wholly-owned subsidiary of United Engineering Re ... sources, Inc. (UER). Signet has maintained a reputation for professional excellence and quality service providing materials testing and inspection services throughout California since 1966. Signet’s depth of resources and proven performance excellence has made our name known. By focusing on inspection and testing, we have become one of the leading independent testing agencies in California. Signet has consistently provided high-quality professional services on thousands of projects in the following markets: - Business Parks, Commercial, Industrial, and High-rises - Substations, Power Plants, Renewable Energy - Water and Sewer Treatment Facilities - Schools, Colleges, and Universities - Roadways, Bridges, Rails, Airports - Civic and Convention Centers - Parking Structures read more