The only manufacturer in Louisiana that I can recall was Treasuretronics. Among other models they made the SST Pro Selectmatic. As far as I can tell this was the first discriminator that came on the market. I was told that this metal detector operates in the VLF range which would explain why it is so sensitive compared to other Beat Frequency Oscillating (BFO's). Anyway was wondering if there is any more info on this metal detector or on Treasuretronics??