At present, there are more than 300 inverter manufacturers in the Chinese market, and the main brands are also maintained at about 20 to 30. Foreign brands still dominate the market of medium and low voltage inverter in China.

With the development of science and technology, higher and newer requirements are put forward for instruments. The development trend of instruments and meters is to constantly use new working principles, new materials and new components, such as ultrasonic, microwave, ray, infrared, nuclear magnetic resonance, superconductivity, laser and other principles, as well as various new semiconductor sensitive components, integrated circuit, integrated optical path, optical fiber and other components.