Yokogawa designs and manufactures precision measurement systems which include Digital Power Analyzers, Mixed Signal Oscilloscopes, Scopecorders, High Speed and Low Speed Data Acquisition Systems, Function Generators, Source Measure Units, Programmable DC Sources, and Standards. Their Optical Test Equipment includes Optical Spectrum Analyzers, Optical Time Domain Reflectometers, Optical Wavelength Meters, and Portable Power Meters and Light Sources.