The DetectorPro Uniprobe pinpointer is available in three models. A land based unit that fits in our pocket, a land based unit that is self contained with headphones, and a water-proof unit that is self contained with headphones. These new high-powered pulse inductance probes can be switched on or off during hunting and retrieval with your metal detector. Or, with an optional PI search coil and rods, it can be turned into a complete PI metal detector! Uniprobe contains today's most innovative Pulse Inductance electronics. The UniProbes perform in all ground mineral conditions, both salt and fresh water beaches too with up to 5-6" depth on coins in the retrieval hole.