James Instruments Inc. is a manufacturer of nondestructive test equipment for concrete and other coarse grained materials. Located in Chicago, Ill., the company supplies a variety of instruments that measure and analyze strength, structure, corrosion and moisture in concrete. James Instruments Inc. has manufactured rebar locator to locate rebar, pipe and other metal objects in concrete. The firm has a vast customer base in more than 45 countries worldwide. It has memberships with a number of organizations, including ACI, ASTM International and Concrete Sawing & Drilling Association.