Larson Systems Inc. has been in business since 1979 and has continued to be an industry leader with our uncompromising top-quality products. With two patents (U.S. Patent Numbers 6,094,980 & 6,289,744) on the Torsion Spring Tester (TST) line and many other ground-breaking designs on other products, LSI has clearly established the standard for others to follow!LSI is an engineering-driven company. We have over 50 spring testing products covering a wide range of performance and price points. We specialize in especially unique testing problems, whether it's a custom tooling for awkward parts or a full-fledged automated testing solution.LSI is also an innovation driven company. Under the name Stone Mountain Pet Products, we design and manufacture equipment for the pet care industry including boarding facilities and Veterinarian Clinics. With the same precision and excellence we custom design kennel systems, dog doors, doggy day care play equipment, dog day care divider systems and agility equipment. We use the finest materials to manufacture and produce the best and toughest equipment on the market.