Metal Detector is a device to locate hidden metal parts, pipes and electrical conductors on land and under water, usually has a electronic circuit and a coil. Previously we wrote about Radio-frequency Identification or RFID which uses the electromagnetic waves the allows automatic identification and localization of objects and living beings. RFID uses complex, targeted technology but per se Metal Detector has not much target or rather it can be used only where broader scanning is required to detect mere presence of Metal with some added exceptions by logical use of Physics.
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