Individuals considering certification as an ASNT NDT Level III, in general, must be:

Well-rounded with a broad understanding of the theory and application of many methods.

Knowledgeable in their respective method, since they will be considered experts in the method.

Familiar with statistical interpretations of in-process control data.

Able to interpret technical articles, even if written in a foreign language.

Experienced in practical applications of NDT methods.