HOW Door Frame Metal Detectors WORKS Door Frame Metal Detector is divided into multiple zones. Each zone represents a specific area of the body, typically from head to toe. Each zone consists of both transmitter and receiver coils. The transmitter emits a magnetic field, while the receiver detects any disturbances in this field caused by metallic objects. When metal is detected in o... https://www.bioroles.com/door-frame-metal-detector/