In two parts you first go through the science of drywasher design

Geological formations and mining history

Iron-infested relic sites

Backed by Garrett's 3-Year Limited Warranty

and performance with the Fisher 11" DD Black Bi-Axial Search Coil

Detech 15 x 12" SEF Butterfly Search Coil for Whites MX Sport ACE 400 In two parts you firstThis Detech 15 x 12" SEF Butterfly Search Coil is for use with the Whites MX Sport metal detector. By upgrading to this coil you will achieve the best depth and most accurate pinpointing. Compared to traditional DD coils, the patented SEF coil technology provides you with more stable operation, better ground balancing and the most accurate target identification. Search coil cover included.