On March 12, 2019, three experts from the examination of measurement standard team of Tai'an City conducted the on-site assessment of verification device on current transformer and voltage transformer in Shandong Taikai Testing Co., Ltd. The team carried out examinations on the declared items in the form of technical data inspection, actual operation audit and on-site Q&A, etc., in accordance with JJF 1033-2001 Rule for the Examination of Measurement Standard. Then confirmed that the company's measurement standards have passed examination, and the company has the ability to start the verification/calibration work. 

On April 9, 2019, Tai’an Market Supervision Bureau issued the certificate of examination of measurement standard for Shandong Taikai Testing Co., Ltd.