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Shopping guide for best metal detectors. A VLF metal detector sends out a ground-penetrating electromagnetic charge that causes any form of metal to become temporarily energized. A receiver coil detects this new energy and sends a signal to the unit's microprocessor. The most obvious result is a tone generated by a loudspeaker.

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The most commonly-used metal detectors are Very Low Frequency (VLF) models, which continually transmit energy at a single powerful frequency, generally ranging between 3 kHz and 30 kHz.

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