1. Whether the unit that purchased the verification/calibration certificate issued by the instrument is a qualified supplier;

2. Whether the instrument supplier has done supplier evaluation;

3. The purchased instrument should communicate the certificate requirements with the user unit, such as range, accuracy, etc.;

4. To check the authenticity of the certificate, you can quickly locate each institution through the menu in the URL query of the measurement forum;

5. Whether all of the above problems occur, the process of our measurement confirmation is as follows:

(1) Confirmation of the capability of metrology technical institutions

(2) Confirmation of the basic information of the traceability certificate

(3) Confirmation of environmental conditions and technical basis for calibration/verification

(4) Confirmation of traceability certificate verification or calibration results

(5) Confirmation of calibration/verification cycle