I. Metal detectors function on two concepts of electricity and magnetism to detect the presence of metals.
II. There are different types of metal detectors such as beat frequency oscillation, very low-frequency detectors, pulse induction, and industrial metal detectors.
III. Metal detectors are used to find hidden metal objects or objects buried underground.
IV. They are also used for various purposes such as land mine detection, geological detection, airport and building security; it is also used in the construction industry to identify the steel bars within reinforced concrete.
V. A beat frequency oscillation metal detector is used to detect metal objects that are about two feet below ground.
VI. Very low-frequency detectors are used among treasure seekers and are highly accurate and sensitive.
VII. A pulse induction metal detector is commonly used by security guards at check points. This type of metal detector is not efficient in differentiating the different types of metal detectors.
VIII. The doorframe metal detector is one of the types of an industrial metal detector. They are used at airports and to secure buildings.

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