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Ultrasound is a high frequency of sound pulses that are emitted from a transducer. The soundwaves propagate through the sample, and reflect at interfaces. The reflected waves are monitored on a detector. The thickness of the sample, and the depth and type of flaw can be assessed using this method on most materials with good sound transmission. 

DPI involves applying a visible or fluorescent dye to the surface of a component. Allowing the dye to enter a discontinuity by capillary action. The method can be applied to any non-absorbent material with uncoated surfaces.

Procedure writing and approval, written practice preparation, personnel NDT qualification, third party consultancy.

MPI involves the magnetisation of a component, followed by the application of ferromagnetic particles. The particles align along discontinuities in the surface, or shallow sub-surface discontinuities. This method is used to test welds, castings and forgings but can only be used on ferromagnetic materials.

Visual testing is a method by which reflected or transmitted light from a test object is viewed with the human eye often utilising optical aids.