A metal detector is an electronic tool used to detect metal in a zone. Useful for finding buried metal hidden objects. They often consist of a handheld unit with a sensor. The detector makes a changing tone in earphones if it detects a metal piece. 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 if it use a display.|
Another common type are stationary "walk through" metal detectors used for security screening at access points in prisons, courthouses, and airports to detect concealed metal weapons on a person's body or hidden anywhere.
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