Without any additional equipment, the inductive proximity sensor can operate electromagnetic clutches, brakes and valves. To actuate the sensor, a metal of any shape and size or a pneumatic cylinder or a machine tool carriage or a drill bit can be used.
The inductive proximity sensor ignores non-metallic objects like oil, water, dirt, etc. It withstands in shock environments and is short circuit resistant.
They are used in industry automation for counting the products, in security systems as metal detectors and in military applications in detecting landmines and other arms.
Credit ;- https://www.electronicshub.org/position-sensors/