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Crack depth determination with the potential probe method is based on the measurement of the electrical resistance between two points on the surface of a metallic work piece. A probe with four spring-loaded and gilded contact pins is positioned across the crack to be measured on the work piece.

A borescope is an optical device consisting of a rigid or flexible tube with an eyepiece on one end, an objective lens on the other linked together by a relay optical system in between.

Liquid Penetrant Inspection (LPI) is a widely used and low cost inspection method used to locate surface breaking defects in all non porous materials such as metals, plastics and ceramics.

Magnetic Particle Inspection (MPI) can be regarded as a combination of two NDE methods namely magnetic flux leakage and visual testing. Magnetic Flux Leakage is a phenomenon where in the magnetic field is expanded from its normal path due to the presence of the air gap normarlly induced by the presence of the discontinuity (ie crack) on metallic material.

Ultrasonic testing (UT) is a family of non-destructive testing techniques based on the propagation of ultrasonic waves in material tested through various probes.