Category for specialized equipment that measures and evaluates noise (electromagnetic interference) generated from electrical and electronic equipment in manufacturing environments. Includes EMI meters, spectrum analyzers, electromagnetic field strength meters, conducted noise meters, and radiated noise meters, used for electromagnetic compatibility (EMC) testing, quality control, and regulatory compliance verification of manufacturing equipment. Essential measurement devices for electromagnetic noise countermeasures in NC machine tools, automation equipment, and control devices, as well as quality inspection of electronic components and circuit boards. Targets equipment with specialized noise characteristic analysis functions, distinct from general electrical measuring instruments.