![]() The metal detectors ignore very small amounts of metal, like the button on your jeans or small earrings. The return signal is detected by the machine and a beeping noise is produced to alert the TSA agent. The magnetic field will be reflected back to the machine if there are any metal objects present, such as a watch or a belt buckle. Metal detectors create a magnetic field by using a brief pulse of electrical current. ![]() Magnetic fields are produced by the flow of current through wires or electrical devices. ![]() Metal detectors use magnetic fields to help identify metal objects. Source: Transportation Security Administration (TSA) ![]() This image shows TSA agents and two metal detectors at a security checkpoint in an airport.
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