Established in 1950 by Safety Pioneer, Paul Skarshaug, STL remains family owned and operated after 60 years. Centrally located in Ames, Iowa, in a new state-of-the-art facility, STL is a hi-voltage testing hub, serving customers in all 50 states and abroad. STL is a leader in developing standards and procedures through participation in the American National Standards Institute (ANSI), the American Society for Testing and Materials (ASTM), and NAIL.

STL is NAIL accredited to test all of the major categories of insulated equipment used by electrical line workers today, including: Gloves, Sleeves, Blankets, Line Hose, Covers, Matting, Hot Sticks & Line Tools, Plastic Guards, Aerial Devices, Bucket Liners, Overshoe Footwear, and Jumper Cables. STL uses state-of-the-art test equipment from suppliers such as Hanco International and Phenix Technologies along with Skarshaug glove inflators and sleeve expanders for visual inspection.

Every item is individually tracked at the laboratory. Gloves and sleeves are individually ID-labeled. Other tested items are given individual test numbers. Individual tracking allows us to identify ownership of items tested, provide detailed itemized test reports, and maintain reliable test records. All items are identified with the test date, the test voltage, and the name of our laboratory.

STL has its own hot-stick & hoist repair and test shop to perform in-house repair, refinishing, and certification of hot-sticks and hoists from most of the leading manufacturers, including A.B. Chance, Hastings, Hook, Little Mule, and Salisbury. Assembly, testing, and repair of protective and insulated jumpers and personal protective grounds is also available.