MRK Industries

Established in 1886, Stoelting Company is one of the leading manufacturers of scientific research instruments. It offers products for physiological and psychophysiological measurement. The company operates a psychological test division that is responsible for researching and authoring new testing materials. Stoelting Company also has a division that maintains a computerized polygraph system. It provides ANY-maze, which is a video tracking system that is designed to automate testing for experiments related to behavior. The company also offers a variety of instrument and accessories that are used by the federal, state and local law enforcement agencies in the United States, as well as Korea, Canada, Russia, Hungary, Turkey, Australia, South Africa and Venezuela.

Electrol Specialties Company is a supplier of custom fabricated stainless steel equipment and controls. Established in the 1960s, the company began as a fabricator of cleaning-in-place (CIP) systems to the dairy industry. Products include tanks, spray devices, and pump suction and discharge manifolds. Electrol Specialties Company provides certified welders, material trace abilities, in-house inspection and weld maps with supporting documentation. It is listed as an Underwriters Laboratory panel builder. The company has completed projects for pharmaceutical, biotech, dairy and food processing companies, including Amgen, Bayer, DuPont, Kraft and Mayfield Dairy. Electrol Specialties Company is located in South Beloit, Ill.