Metal detectors are devices used for finding and recovering metal. These devices have important applications in civil engineering, archaeology, mineral prospecting, and oceanography, as well as in the military.  Metal detectors consist of a sensor that sends out an electromagnetic pulse that is reflected by a target object to produce a response indicating the type of material. The Deep Tech Smart Fish Technologies underwater metal detector uses a series of high-performance transducers embedded in the head of the metal detector to detect and visualize the characteristics of potential objects based on their acoustic return in deep water. With an advanced discrimination algorithm and advanced setup functions, it's possible to adjust sensitivity, gain, notch filters, discrimination setting, ground balance, and frequency channels to optimize results under different circumstances.