1 applications, bridges, tunnels, walls and other concrete reinforcing bars, structural engineering, steel distribution and to protect the layer thickness, bar diameter of the probe; also be non-ferromagnetic magnetic media (such as wires, pipes) to detect and distribution of the quality of construction and acceptance testing of concrete structures: the structure of the building to assess the safety and durability; of the old structure to assess the amount of reinforcement when the transformation test; on the floor or the wall of the cable, plumbing pipes and other distribution and trend detection.