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ISO 16823:2012 specifies the principles of transmis­sion techniques. Transmission techniques can be used for: a) detection of imperfections; b) determination of attenuation. The general principles required for the use of ultrasonic examina­tion of in­dustrial products are described in ISO 16810. The transmission technique is used for examination of flat pro­ducts, e.g. plates and sheets. Further, it is used for examinations e.g.: 1) where the shape, dimensions or orientation of possible imperfections are unfavourable for direct reflection; 2) in materials with high attenuation; 3) in thin products.