Production and sales of pressure gauges, thermistors, thermocouples, digital displays, and bimetallic thermometers; Sales of instruments, meters, wires and cables. Licensed projects: Manufacturing of wires and cables (projects that require approval by law must be approved by relevant departments before conducting business activities, and specific business projects are subject to approval results) General projects: Manufacturing of industrial automatic control system devices; Sales of industrial automatic control system devices; Manufacturing of electronic measuring instruments; Sales of electronic measuring instruments; Manufacturing of liquid tight components and systems; Sales of liquid tight components and systems; Manufacturing of power electronic components; Sales of power electronic components; Manufacturing of supply instruments and meters; Sales of supply instruments and meters; Manufacturing of specialized instruments and meters for environmental monitoring; Sales of specialized instruments and meters for environmental monitoring; Manufacturing of pneumatic power machinery and components; Sales of pneumatic power machinery and components; Manufacturing of monitoring and detection instruments for water quality pollutants; Sales of water quality pollutant monitoring and detection instruments and meters; Manufacturing of electrical instruments and meters; Sales of electrical instruments and meters; Manufacturing of intelligent instruments and meters; Sales of intelligent instruments and meters; Manufacturing of electrical signal equipment devices; Sales of electrical signal equipment devices; Manufacturing of instruments and meters; Sales of instruments and meters; Operation of wires and cables; Manufacturing of metal materials; Sales of metal materials; Manufacturing of electronic components; Retail of electronic components; Manufacturing of specialized equipment for refining and chemical production; Sales of specialized equipment for refining and chemical production; Manufacturing of mechanical and electrical equipment; Sales of mechanical and electrical equipment; Electronic product sales; Sales of electrical equipment; Manufacturing of electrical equipment; Sales of metal products