Hickok Incorporated and its subsidiaries design, manufacture, sell, and export diagnostic tools for automotive diagnostics and testing in the United States, Australia, Canada, England, Germany, and internationally. It operates in two segments, Indicators and Gauges, and Automotive Diagnostic Tools and Equipment. The Indicators and Gauges segment develops and manufactures aircraft and locomotive cockpit instruments, precision indicating instruments, and the DIGILOG instrument, a customizable indicator to the companies that manufacture or service business and pleasure aircraft; and indicators and gauges to original equipment manufacturers (OEMs), servicers of locomotives, and operators of railroad equipment in the locomotive industry. The Automotive Diagnostic Tools and Equipment segment provides products to support the testing or servicing of automotive and truck systems using electronic means to measure vehicle parameters; and vehicle emissions testing equipment. This segment sells its products to several automotive OEMs, and to the aftermarket using jobbers, wholesalers, and mobile distributors. The company was founded in 1915 and is headquartered in Cleveland, Ohio.