Magnetic particle testing is used for detecting surface and subsurface discontinuities in ferromagnetic parts. The part is magnetized by using portable magnetizing yoke that induces a magnetic field in the part.

Dye penetrant testing is an NDT method of revealing discontinuities that are open to the surfaces of solid and essentially nonporous materials. Liquid penetrant is applied to the surface and is drawn into defects by capillary action.

Radiographic testing is an NDT method of inspecting materials for detecting internal flaws by using the ability of short wavelength electromagnetic radiation (high energy photons) to penetrate various materials. Either an X-ray machine or a radioactive source (Ir-192, Co-60) can be used as a source of photons

Ultrasonic thickness gauging is a method of performing non-destructive measurement (gauging) of the local thickness of a solid element basing on the time taken by the ultrasound wave to return to the surface.