A magnetometer is an instrument designed to detect and measure magnetic fields. In cybersecurity and physical security, magnetometers are often used to identify concealed electronic devices or tampering attempts, as many electronic components and motors emit distinct magnetic signatures. Security professionals may use magnetometers to scan for hidden cameras, unauthorized recording devices, or other covert electronics in sensitive environments. By analyzing the strength and direction of magnetic fields, magnetometers help enhance security by revealing threats that may not be visible to the naked eye.