With regard to textual research, you must first find out your industry, and the seniors in the company will tell you what to take.
For personal development, the following three certificates have the highest gold content.
The domestic certificate quality supervision bureau has high gold content and wide application scope. Specific examination information can be found on the website of your provincial special inspection institute.
Foreign certificates ASNT and PCN are the most famous in the world.
ASNT refers to the certificate recognized by American nondestructive testing association, and ASME, AWS, API and so on all recognize ASNT's certificate.
PCN is a certificate of British Nondestructive Testing Association, which has the strongest credibility in the world and should be regarded as the best among more than 30 countries in the European Union. In addition, the standard EN473 was originally compiled according to PCN, so PCN conforms to EN473 and is even stricter than EN473. People who get PCN certificates like to say that their certificates are PCN, not EN473, because in their eyes, PCN can represent their own abilities. The Hong Kong government has made it mandatory for local NDT personnel to hold PCN certificates before engaging in NDT.
Another reason may also be that the two countries in the world have relatively developed industries and many colonies, so their recognition is relatively wide.