Mars Discovery 13 inch DD Coil for Minelab X-TERRA Dual Frequency 3 & 7.5 kHz Detector

The Mars Discovery 13 is MarsMD's 13 inch (33 cm) Double-D search coil, in the version for the original Minelab X-TERRA 505 and 705, dual frequency 3 and 7.5 kHz. It is waterproof and comes with a coil cover, a connector protection cap, the coil attachment bolt and nut, and two rubber rings.

What is in the box with the Mars Discovery 13

MarsMD's standard contents for the Discovery 13

• Mars Discovery 13 DD search coil
• Coil cover
• Connector protection cap
• Coil attachment bolt and nut
• Two rubber rings

Which detectors the Discovery 13 fits

• Minelab X-TERRA 505
• Minelab X-TERRA 705

The 3 and 7.5 kHz version of the Discovery 13 fits the X-TERRA 505 and X-TERRA 705. We also carry versions of the Discovery 13 for other detectors, in our MarsMD search coils collection.

The dual frequency Discovery 13 runs at one of its two frequencies, 3 kHz or 7.5 kHz, at a time. The frequency is switched on the coil, not from the X-TERRA control box: touch a 9V battery across the two contacts on top of the coil. A green light shows that the frequency has changed; then turn the detector off and back on to complete the change.

When to use the Discovery 13

Having 3 kHz and 7.5 kHz in one coil lets an X-TERRA 505 or 705 owner change frequency without changing coils. A 13 inch Double-D coil sweeps a broad path, which pays off where finds are scattered thinly. Around heavy iron or in brush, a coil this size is harder to steer and tends to hear several targets at once, so we would go back to the stock coil there; the Goliath 15 is the other Mars size we carry for the X-TERRA. Walk in lanes that overlap by about half a coil width, and expect the coil size to help coverage first; any extra depth depends on the soil and the target. Our metal detector coil guide explains how coil size and type trade coverage for separation.

MarsMD built the Discovery as a well balanced, reliable coil for a wide range of search tasks, and says it gives a considerable depth increase and more ground coverage than standard coils. Its weight starts from 520 g (18.3 oz) and can be higher depending on the detector version. The coil is waterproof and shielded against electrical interference. The outer shell is high impact resistant, UV protected plastic filled with a high quality epoxy resin, the coil mounting bracket is extremely robust, and a cable strain relief keeps the cable entry watertight. The connector screws on.

Mars Discovery 13 specifications

MarsMD covers its coils with a 3-year warranty from the date of purchase. Every Mars coil we carry is in our MarsMD search coils collection.

Serious Detecting is a family-owned, authorized MarsMD dealer with a showroom in Ypsilanti, Michigan, and our staff help by phone or email.