Test of the new Garrett Goldmaster 24 ... for 0.5 grams of 24 carat gold under the IRON STONE ... IRON stone is strongly mineralized ... so the sensitivity is stable at Sensitivity 5 max ... Sensitivity 6 will already give an answer to the Iron Stone itself. Many top VLF detectors  it s problem eliminate the signal from this Iron Stone and give this Mineralized Stone a positive non-ferrous response ..   For effective and stable detection on such a heavily minerali