In the rapid development of China's power system, the use of power safety tools and construction tools has laid a solid foundation for the improvement of the quality of power grid construction and the improvement of construction and operation safety factors. Electric power tools can generally be divided into three categories: insulation safety tools, general protective safety tools, safety fences (nets) and sign boards. CTI provides measurement calibration services for various safety tools, construction tools and other measuring instruments used in the power system to provide technical support for ensuring the safety of the power grid and improving the power quality of the power grid.