Yesterday did few short test with Nel Tornado coil and hot rocks- results are disaster, all hot rocks gave positive signal! Checked with tester receiver resistance and its way to hight compare to minelab Pro coil or old 1050 or Coiltek Little Joy or Minelab 8 or Sunray X 12 or Minelab Slim, this coils I have. Coil Cable too different what the rest FBS coils producers use, some sort they use what they have... Now I think what Nel producers doo? one posibility they do new coils on the table without any thorough field test or they donbt have knowlige how to do it right? Very sad 