Watch the video, a practical search with Mars Tiger coil for Minelab X-Terra metal detector. The peculiarity of the coil is a dual frequency which includes 7.5 kHz and 18.75 kHz.
Mars Tiger coil for the Minelab X-Terra series of metal detectors. Ellipse: 13 inches, coil type: DD. It can operate both at medium frequency (7.5 kHz) and high frequency (18.75 kHz). Simple switching between frequencies. Reliable and effective.