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Ace 400 and rusty round bottle caps..
- Thread starter Dan-Pa.
- Start date
The iron audio always helps to distinguish rusted metal from silver or copper which gives a clear signal. Round bottle caps are often aluminum and some are rusty metal. I think the concentric coil will also help better ID bottle caps as junk. Pretty well all DD coils read bottle caps as coins. Having iron audio and or a concentric coil is bonus.