Detecting the presence of certain components in nature is not easy with the naked eyes. For this you need to rely on certain technical equipment like the metal detectors. These are devices which are capable of detecting metal or metallic components underneath the surface of earth or which are kept hidden anywhere. Since its invention and usage in a commercial level, the demand and application has achieved a wide range. The metal detectors find various land mines, hidden treasures etc. It is widely used in security checks in airports for catching guns, knives and other weapons which are dangerous and also in regions where utmost vigilance is needed like famous archeological museums. The device is also employed in detecting the presence of metal content in food materials. Another area of application is the construction industry. This helps in finding out the pipes, bars and other steel components in floors and other parts of the building structure.