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F4 FISHER Fisher F4 metal detector is a mid-range with excellent performance that allows you to search on any type of terrain. The model F4 is equipped with a fundamental system of audio detection in 4 shades to differentiate various types of metals. The Fisher F4 metal detector is a mid-range that allows research on all types of terrain. The large display 11 segments and 4 distinct audio tones detection, provide an accurate indication of detected metal. The digital menu allows you to change various parameters such as search sensitivity and discrimination of metals. Fisher F4 has the possibility of eliminating all the interference caused by salt water, this means that this metal detector can also be used for research on sand and shoreline.