Magnetic Particle Testing and Liquid Penetrant Testing is usually performed in addition to a volumetric NDT. It is limited to those materials that can be effectively magnetized. Ferromagnetic particles are applied to the test surface of the magnetized parts and align themselves in areas of magnetic flux leakage – indicating the presence of discontinuities. There are many techniques that make MT suitable for a wide range of parts with various shapes and sizes. MT can be performed with portable equipment or stationary systems.