Held Metal Detector is an electronic instrument, which is used for detecting the presence of metal. It helps users in finding metal inclusions that must be hidden within objects or buried underground. This detector consists of a sensor that can be swept over objects or ground. If it detects any metal, then instantly indicates that through changing tone in earphones. Moreover, the tone of Held Metal Detector depends upon the distance, if the metal object is nearer then its tone is higher. Therefore, it is useful for security screening at airports, courthouses and prisons.