The qualification certificate of campus staff is issued by the National Certification and Accreditation Administration. According to the inquired information, the certificate of internal calibrator was issued through theoretical examination and skill examination. Those who pass the training and examination shall be authorized by the national quality and technical supervision, certification and accreditation supervision and management department to issue the certificate of internal auditor. The certificate of internal school personnel is the employment certificate of the enterprise engaged in the measurement of internal school personnel. This certificate can be issued by the enterprise itself, which is only equivalent to a training certificate, proving that it has undergone relevant operation training and meets the post requirements.