This is a non-destructive testing equipment that utilizes eddy currents to detect defects on the surface and near-surface of metallic materials. It generates eddy currents inside metals through electromagnetic induction and detects changes in eddy currents caused by defects such as cracks, corrosion, material changes, and thickness variations. Used for inspection of aircraft parts, automotive components, piping, heat exchanger tubes, and welded joints, it is essential for quality control of conductive materials. Unlike magnetic particle testing or penetrant testing, it enables high-speed non-contact inspection and is suitable for integration into automated production lines.