The Ultimate 13" is the absolute reference between the metal detector coils.
Developeb by Bulgarian manufacturer Detech, in cooperation with other major detector companies, is probably the best designed coil on the market.
It features an increase in depth, stability, power, sensitivity and target separation more over than 30-50% compared to stock coils.
To work correct, the metal detector must be updated to V2.77 - V2.78 software release.
The Ultimate 13" DD is completely waterproof and includes a coil cover.
Compared to classic DD coils, Ultimate 13” has these advantages: