NDT work is divided into several levels.

There are three grades: 1, secondary and tertiary. It is necessary to pass the exam. Need to have different work experience and education. The exam time is different. The undergraduate course can be directly tested at the second level. They need more than one year's work experience. The rest can only take level 3 directly from 1. They must work for five years on the basis of level two before they are eligible to take the exam.