Nowhere is the need for material integrity more obvious than in medical devices that are implanted into human beings. A failed device inside an aircraft or power plant may, under some circumstances, cause a problem.

An important element in ensuring the quality of finished parts is nondestructive testing (NDT). NDT is the inspection of material or parts without impairing their future usefulness.

Magnetic particle inspection (MPI) can be performed a number of different ways and oftentimes any of these methods are acceptable under the specification called out for performing the test.