Product: The Minelab PRO-FIND 40 is a pinpointer designed to detect metals on land and under water Ferrous ID: Two different responses help you to distinguish ferrous junk from non-ferrous treasure Waterproof: A rugged waterproof design ideal for beach and river pinpointing. The perfect companion for a waterproof detector Re-Tuning: Rapidly re-tune your PRO-FIND 40 to suit your environment at the press of a button, minimizing interference in challenging ground conditions Better Depth: Finely tuned algorithms and circuitry deliver a solid increase in detection depth by 10 percent making PRO-FIND 40 Minelabs deepest and most accurate pinpointer