Clean Beaches-- Best Machine on the Beach! White's Surfmaster P.I. Dual Field, incredible depth even on very small items.
Dirty Beaches-- Minelab Xterra 705 with a DD Eliptical Coil, almost as deep as the PI but sometimes hard to tell gold from alum. Most times gold is much cleaner. Eliptical coil makes a big difference on in the wet sand.