Handheld metal detector is a portable electronic device designed to locate metal objects concealed within various materials or environments. Typically lightweight and battery-operated, it consists of a sensor coil housed in the search head, a control box with settings, and an alert system (often audible or vibrating).

Its operation is based on electromagnetic induction. When switched on, the coil generates a magnetic field. Bringing it near a metallic object disrupts this field, inducing an eddy current in the metal. This change is detected by the device, triggering an alert to the user. Sensitivity can often be adjusted to ignore small or specific types of metal.

These detectors are invaluable tools across multiple sectors. In security, they are essential for screening individuals at airports, schools, and public events to prevent weapons from entering secure areas. In construction and renovation, they help locate rebar, pipes, and wiring hidden within walls or floors, preventing accidents. Archaeologists and treasure hunters use them to discover historical artifacts and coins. Additionally, they serve practical everyday purposes, like finding lost keys or nails in wooden surfaces.

Simple to use, reliable, and non-invasive, the handheld metal detector is a fundamental instrument for safety, industrial work, historical exploration, and personal convenience.