Research coil 9" (23 cm) concentric low frequency (3 kHz).Suitable for looking for great objects in depth.Ideal for highly conductive targets such as silver and copper. Waterproof and water proof, can be immersed in water up to 1 meter deep
This Research coil 9" (23 cm) concentrically is also available in three frequencies: 3 kHz (low frequency) - 7.5 kHz (medium frequency) - 18.75 kHz (high frequency) Compatible Metal Detectors: X-Terra 705 Gold, X-Terra 705, X-Terra 505 and X-Terra 70