Coil Big is the deepest coil in the world for different metal detectors, which is confirmed by tests of independent experts in the various forums and searchers at metal detecting meetings! It is recommended to use as a coil for deep searching. Coil is excellent for finding large targets as well as for small targets which are 1g and more at 25 cm depth. This coil is superior to standard coil in depth by 40% (in comparison with the standard coil 10 ") and in ground coverage of between 50% (in comparison with the standard coil 10 "). This coil is recommended for use in open terrain. Coil is fully submersible, body is filled with epoxy resin and additionally has a black protective coating that is used for the protection of marine boats, and it makes it possible to use the coil without a coil cover. The Big coil copes excellently with high and medium soil salinity. Recommended for professionals.