The ability of a material to conduct electric current, often measured and evaluated in non-destructive testing to assess material properties and integrity.

A specially prepared metal block with intentionally created cracks, featuring two adjacent regions designed for the application of different penetrants, enabling a direct and comparative assessment.

A specially designed test block with known characteristics used to calibrate non-destructive testing equipment and verify its performance.

The process of establishing a relationship between the response of a non-destructive testing instrument or system and a known reference or standard.