Conductive and magnetic metals, such as iron, chromium steel, carbon steel and tungsten carbide, are the most easily detected metals because they have significant effects on the magnetic field of metal detectors. The same is true of other low-resistance non-ferrous metals, such as copper, aluminium, lead, brass, bronze, etc. Although they are not magnetic, they are conductors and easy to detect. Only pure, high resistance and non-magnetic metals, such as stainless steel, pose the greatest challenge to metal detectors. They have poor electrical conductivity and are difficult to detect, but they are often used in food and packaging machinery. However, as long as the detectors have good performance, they can still be reliably identified.
Metal detector is a kind of instrument specially used to detect metals. In addition to detecting mines with metal shells or metal parts, it can also be used to detect wires hidden in walls, pipes and cables buried underground. It can even explore treasures underground and find metal objects buried underground. Metal detectors can also be used as tools for national defense education and popular science activities for teenagers, which is of course interesting.