Research coil 9" (23 cm) concentric middle frequency (7.5 kHz).Good detection depth, good objective separation and accurate pinpointing. 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, X-Terra 70, X-Terra 50 and X-Terra 30.