A metal detector device detects the presence of metal in the vicinity. Metal detectors locate metal inclusions hidden within objects or metal objects buried underground. Frequently comprised of a handheld unit with a sensor probe swept across the ground or other objects.

When the sensor comes into contact with a piece of metal, the earphones change tone or the needle on an indicator moves. The device indicates distance; the closer the metal is, the higher the tone in the earphone or the higher the needle goes.

Large portable metal detectors locate metallic items such as jewelry, coins, clothing buttons and other accessories, bullets etc

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