OTC had an extensive line of specialized equipment and diagnostic systems for both is an automotive tool and tool manufacturer. It was founded by Godfrey Kaplan, who operated a small machine shop in Owatonna, Minnesota. By 1934, the OTC was selling to farmers and service stations. The devices were sold directly to customers from display boards fitted with panel trucks or converted autos.

OEM and aftermarket customers. OTC is a global supplier of automotive and heavy-duty electronic diagnostic instruments, fuel system service equipment, automotive specialty tools, pullers, heavy-duty truck tools, shoplifting equipment, and hydraulic components.