Well, thanks to forum member YubaJ I just ended up with a very slightly used White's Sierra Pulse Pro, or as it is more commonly referred to, the White's SPP. Bonus is it came with three coils, the standard 12" round mono, a 6" round mono that was part of an introductory special when they first came out, and a 5" x 9" Miner John folded mono coil. The Sierra Pulse Pro is nothing more than a White's TDI SL with the Conductivity switch and Pulse Delay knob both removed. The unit is locke