| http://www.w3.org/ns/prov#value | - In some embodiments, a plurality of calibration coils 127 are used, each attached to or adjacent to a calibration piece of metal (e.g., different thicknesses or having different defects, cracks, pits, or other anomalies), and each is tested and a calibration result is stored in a memory of eddy-current detection-and-display system 101.
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