Manufacturing of experimental analytical instruments; Manufacturing of testing machines; Manufacturing of instruments and meters; Manufacturing of electronic measuring instruments; Glass instrument manufacturing; Manufacturing of other general instruments; Manufacturing of electronic components; Sales of testing machines; Sales of experimental analytical instruments; Sales of instruments and meters; Sales of electronic measuring instruments; Wholesale of electronic components; Electronic product sales; Sales of industrial automatic control system devices; Sales of labor protection equipment; Wholesale of hardware products; Sales of refrigeration and air conditioning equipment; Sales of mechanical equipment; Installation services for ordinary mechanical equipment; Instrument and meter repair; Technical services, technology development, technology consulting, technology exchange, technology transfer, and technology promotion; Import and export of goods;