Tokyo Koki Co., Ltd. engages in the manufacture and sale of testing and measurement machines. It operates through the following segments: Testing Machine, Engineering, Overseas, and Others. The Testing Machine segment manufactures and sells test and measurement equipment through its subsidiaries. The Engineering segment sells fasteners or locks and also offers consumer services through its subsidiaries. The Overseas segment manufactures and sells plastic injection molded products such as parts of office furniture, automobiles, and home appliances. The Others segment includes real estate leasing. The company was founded on March 20, 1923 and is headquartered in Tokyo, Japan.