Shenzhen huazhonghang Technology Testing Co., Ltd. was established in 2003, and has passed the CMA certification, CNAs certification and metrology certification. It is a third-party calibration and testing institution and instrument calibration institution integrating technology research and development, instrument calibration and testing, instrument calibration, measuring instrument calibration, calibration certificate issuance, measuring instrument verification, measurement calibration and testing, training and consulting. It is also a national high-tech enterprise. After 18 years of development, China Airlines has become the calibration agency company of the national measurement brand.