Professional provisionTesting of high-voltage electrical insulation tools, calibration of gas relays, calibration of pressure relief valves, calibration of measuring instruments, calibration of instruments, calibration of measuring instruments, detection of SF6 gas containing sulfur hexafluoride, filing of energy efficiency testing, filing of water efficiency testing, 3Q verification, testing of angle and ratio differences of current/voltage transformersThe service area includesHebei, Shanxi, Liaoning, Jilin, Heilongjiang, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Shandong, Henan, Hubei, Hunan, Guangdong, Hainan, Sichuan, Guizhou, Yunnan, Shaanxi, Gansu, Qinghai, Inner Mongolia, Guangxi, Ningxia, Xinjiang, Xizang, Beijing, Tianjin, Shanghai, Chongqing.