Tarsacci MDT8000 using the NZ coil I have found from the lightest ring …a small sterling silver ring 1.1gram ring to the heaviest yet, a non-magnetic stainless steel 9.4 gram with small diamond at Kariotahi Beach. Also found have been tent pegs, nails, bottlecaps and trash along with more rings. The unit will go into overload in places, and had to manipulate settings and raise the coil a bit. Not perfect, but nonetheless produces results. I use this unit 95% of the time now for east and west beaches and relic hunting is on odd occasions shared with the XP Deus.