A round coil for a metal detector with a diameter of 8 inches has a frequency of 7 kHz – this is the best value for finding medium-sized coins made of precious metals. A small frequency makes it possible to increase the search depth without being distracted by small targets, mineralization and heterogeneity of the soil. The mono coil has a cone-shaped signal, which allows you to narrow the search area and find gold jewelry, coins. The device is suitable for searching in inaccessible areas with rocky soil, shrubs. The equipment can be used to search for medium objects at a depth of up to 20 cm.