Signet Testing Laboratories has been a leader in the materials engineering and testing industry since 1966. The firm was founded in Northern California by a licensed civil engineer and metallurgist. Signet currently has offices throughout California including: Sacramento, Hayward, Anaheim, and San Diego. Signet's depth of resources and proven performance excellence has made our quality name known throughout California. By focusing on inspection and testing, we have become one of the leading independent testing agencies in California.