A Secret Metal Detector is an electronic instrument which detects the
presence of metal nearby. Secret Metal Detectors are useful for finding metal
inclusions hidden within objects, or metal objects buried underground. They
often consist of a handheld unit with a sensor probe which can be swept over
the ground or other objects. If the sensor comes near a piece of metal this is
indicated by a changing tone in earphones, or a needle moving on an indicator.
Usually the device gives some indication of distance; the closer the metal is,
the higher the tone in the earphone or the higher the needle goes. Metal
detectors used for security screening at access points in prisons,
courthouses, and airports to detect concealed metal weapons on a person's body.
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