The manual describes the physical foundations of capillary non-destructive testing, technology, technical means and practical methods for their implementation. The procedure and main provisions of certification under the three-level European system of personnel qualification are described. The manual is recommended for students of technical schools and higher educational institutions, as well as for training nondestructive testing specialists working in various fields of industry, to pass certification exams for I, II and III levels of qualification of personnel in capillary nondestructive testing.