1. Let's see which authentication institution issued the certificate first, and then find the authentication institution official website. Each certificate has a certificate number. Enter the number into the official website for inquiry. If proof can be found, it means it is true. If you can't find it, it means that the testing station has no testing record at all, and the certificate is naturally fake.
2. Evaluation institutions should have corresponding qualifications, such as CMA, CAL, CNAL, CNAS, IAF, ILAC-MRA and other certifications. Among them, CMA is the basic requirement of national laws for testing and inspection institutions.
3. The certificate must be stamped with the company's steel seal or red seal anti-counterfeiting mark, both of which can be used.
The certificate shall be signed by the inspector and auditor. If there is only one signature, it is also unqualified.
5. The conclusion of the certificate should conform to the naming rules in GB/T 16552-20 17, and the place of origin and some ill-defined trade names cannot participate in naming.