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Non-destructive testing (NDT) consists of a group of element testing methods for examining the serviceability of a part without jeopardizing its stability. In principle, NDT attempts to locate defects in a part's surface area that forecast future failure prior to the part fails in service and without jeopardizing the part's energy.

Comparable to fluorescent dyes, magnetic particle testing employs a layer of great iron particles applied to a briefly magnetized part. Both liquid penetrant and mag particle testing use a quick, economical methods of nondestructive flaw detection, they are both minimal to spotting the length and width of a flaw.
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