Metal detector technology
Most consumer-grade metal detectors use an older technology called VLF (very low frequency) detection. A VLF detector uses electricity and magnetism to generate an audible signal when something is detected.
How it works?
Metal detectors have two coils, a larger transmitter coil and a smaller receiver coil. When activated, electricity flows into the outer transmitter coil, creating an electromagnetic field. This magnetic "glow" is what metal objects pick up on to identify themselves.
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