Metal Detector : Geophysics Instrument for metal detection and treasure hunting. In geophysics, resistivity method (wenner array) is the best known technique for deep penetration. The operating principle of GI depends on resistivity. It is a professional deep penetrating resistivity instrument which is able to scan a deeper and a larger area by its 4 probes that have contact with the soil. GI detects anomalies of metal, treasure, cave, tunnel, grave, mineral, ore, water, deposit. Please visit our website www.metaldedektor.com/english.html for more information.