After using my Omega 8000 and the Delta 4000 for a considerable period of time.... I've come to the conclusion that these units are "hot on gold" !! Not natural gold but jewelry type gold... I've found many gold rings and earings and even quite a few gold chains. When I first got my Omega a friend told me.....you can kiss gold goodbye!! He claimed that with the Omega and DeltaI would find lots of silver but won't do well on gold. Not the right frequency ..he said. I promptly ignored his coments and went on to find lots of gold. Why?? Were we not all lead to believe that you need a high 15KHz unit for gold sensitivity? Don't get me wrong...love the Omega and the Delta backup but I'm wondering ...................what makes them "hot on gold" ??