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Commercially available collar and its transducers: (a) a US-based MsSR3030 transducer (Guided Wave Analysis LLC, San Antonio, TX, USA) [175]; (b) a set of magnetostrictive transducers made for high temperatures [166]; (c) a UK-based collar and its transducers (Guided Ultrasonics Ltd., London, UK) [176]; (d) a Japan-based collar and its transducers (Olympus Co., Tokyo, Japan) [177] and (e) a UK-based collar and its transducers (Teletest® Focus, Cambridge UK) [178].
