What is the difference between the certificate of authentication and calibration certificate

Appraisal certificate is according to the national appraisal standard requirements for appraisal,

Calibration certificate is a reference to the relevant national standards to do, because there is no clear national standards or industry standards.

Such as total station identification is the identification certificate, GPS identification is currently the calibration certificate, because the GPS standard has not come out.

Personal opinion, for reference!