Engineers and technical staff working in Manufacturing Industries, Process and Product Development Centres, R & D Laboratories, Testing, Standards and Certification/Inspection Agencies must have a good knowledge of the Non-Destructive Testing methods and processes for their professional growth and development. Considering the importance of this subject, many universities and engineering colleges have introduced this subject either as a "Core" subject or as " an Elective" subject in their Mechanical Engineering Curriculum. Also, an awareness must be created amongst Mechanical Engineering and Manufacturing Technology Students about the job opportunities available in Testing, Inspection and Quality Control Agencies and Certification Institutes and in related industries. The Book has been developed for students who are preparing for their university examinations and for enhancing their professional knowledge and competencies in this area.