Minelab X-Terra 505 Universal Hand Held Metal Detector Battery Powered 3705-0113 with Pinpoint Indicator and Multi-Segmented Notch Discrimination Compatible with LF (3kHz) waterproof coils as well as MF (7kHz) and HF (18.75kHz). The LF coil option is ideal for hunting large, deep targets. All 7 X-Terra accessory coils can now be used on the 505. Increased Ground Balance capability, range now (0-50), allowing user to adjust to ground mineralization. Extra detecting pattern - Now features 3 preset detecting patterns, that can also be customised, plus All Metal mode. Larger discrimination range...allows for finer discrimination of high conductive targets. Choice of 1,2,3 or 4 Tone ID's plus Multi-tone Target ID (19) response options.