Horiba, Ltd. (?????, Kabushiki-gaisha Horiba Seisaku-sho?) is a Japanese manufacturer of precision instruments for measurement and analysis. They make instruments that measure and analyze automobile exhaust gas (80% share of the world market), and environmental, medical and scientific applications. Horiba is one of the top 25 analytical and life sciences instrumentation companies in the world. Horiba was founded in 1945 by Masao Horiba, who graduated in nuclear physics from Kyoto University and in the early 1950s started mass-production of pH meters. The present company was registered in 1953. From 1959 until 2002, Hitachi was a principal shareholder, and the two companies retain close connections.