The 15 cm HOT double-D search coil offers the same depth search performance as the 20 cm concentric round coil and separates non-ferrous and precious metals better from iron in case of heavy scrapping. It is somewhat more stable than the 15 cm concentric search coil due to the mineralized ground and is also very suitable for beach searching. Our recommendation on old settlement sites and on all soils with alkaline or Magneten mineralization.compatible with Lobo Supertraq, Tejon, Cibola, Cibola SE, Vaquero and Vaquero2-Germania.