This text is useful reading for all those concerned with the non-destructive testing industry as well as undergraduate students of materials science, metallurgy, mechanical engineering and physics. The technique of ultrasonic testing is now by far the most practised form of non-destructive testing. It is extensively employed in the aircraft, nuclear, oil and gas industries. It covers the basic principles and practices of ultrasonic testing, starting with the basic theory of vibration and propagation, design and properties of probes, and then proceeding to the principles and practice of the various ultrasonic techniques for different types of component and structures, both metallic and non-metallic. The design and operation of various types of equipment are covered and references to appropriate national and international standards are provided. Numerous applications are discussed and special attention is paid to the latest developments. A large number of references is provided in order to enable the reader to obtain further information.