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Coil 10.5" DD 7.5 kHz for Minelab X-TERRA Round coil search to Double D 10.5" comes in two different frequencies: middle frequency (7.5 kHz) and high frequency (18.75 kHz), this is the one with medium frequency 7.5 kHz. Resistant and water splashes and rain), but it can not be immersed in water. The coil 10.5" DD average frequency (7.5 kHz) has an excellent ground cover and a good depth on most targets. Ideal for research in high mineralization content soils. Metal Detector compatible: X-Terra 705 Gold, X-Terra 705, X-Terra 505, X-Terra 305, X-Terra 70, X-Terra 50 and X-Terra 30.