Horiba Ltd. engages in the manufacture and sale of instruments and systems for various industrial applications. It operates through the following segments: Automotive Test Systems, Process & Environmental Instruments & Systems, Semiconductor Instruments & Systems, Medical-Diagnostic Instruments & Systems, and Scientific Instruments & Systems. The Automotive Test Systems segment sells emission measurement systems, automotive emission analyzers, onboard emission measurement systems, driveline test systems, engine test systems, break test systems, and drive recorders. The Process & Environmental Instruments & Systems segment manufactures stack gas analyzers, water quality analysis and examination systems, air pollution analyzers, and environmental radiation monitor. The Semiconductor Instruments & Systems segment includes mass flow controllers, chemical concentration monitors, reticle/mask particle detection systems, and residual gas analyzers. The Medical-Diagnostic Instruments & Systems segment offers equipment for blood sample analysis. The Scientific Instruments & Systems segment sells particle-size distribution analyzers, x-ray fluorescence analyzers, Raman spectrophotometers, spectrometers, gratings, and pH meters. The company was founded by Masao Horiba on October 17, 1945 and is headquartered in Kyoto, Japan.