I went out with the 3D today to find nickels only. After about 3 hours today, 33 nickles later, and a lot of tabs. I found something out about my unit. Not sure if everyones is the same or not. I found if the salt mode says nickle and the enhanced mode doesn't...it's not a nickle. If the enhanced mode says it is a nickle and the salt mode doesn't..not a nickle. Only when both modes showed nickle was it right...100% of the time. What I ran into was salt said nickle, enhanced said tab...it was a square tab. When enhanced said nickle..salt said foil...it was a square tab as well. Again, not sure all are the same or not, but if I want 100%, then this is what I do. Hope this helps someone or at least opens a eye for others. I was noticing the trend and had to prove it to myself today. Good luck to all.