Inductive sensors detect metal objects contactless and wear-free. For this, they use a high-frequency electromagnetic AC field that interacts with the target. Inductive sensors generate this field via an RLC circuit with a ferrite coil.M30 x 1.5 threaded tubeChrome-plated brassLarge sensing rangeDC 4-wire, 10…30 VDCChangeover contact, PNP outputM12 x 1 male connector