The metal detector is one of the most useful detectors available. They have a wide variety of uses, including: military use, airport and security uses, for geophysical prospectors, and for beach-combers and treasure hunters. Many metal detectors also use radar in their systems, and so they are considered part of the detector radar family.

Metal detectors are made up of an oscillator that produces an alternating current that passes through a coil, which creates an alternating magnetic field. This means that when an electronically conductive metal is near the detector, it creates eddies of air, which causes a change in the magnetic field, which enables the operator to see where the metal is.

Handheld detectors are the most common, and are used in the majority of cases. Even land mines can be detected through the use of handheld devices. However, for really deep metals, ground penetrating radar is used in conjunction with the metal detector to unearth the hidden metal.

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