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A group of people have been doing some tests in Australia to determine the deepest detector in highly mineralized soil. Nothing beats the Modified Minelab SD2000. The SD2000 leaves newer models like the Minelab GPX4000 way back in the depth stakes. With the right modifications the SD2000 is very close in sensitivity to the 3000 and 4000 series. I have published most of the mods on the modifications forum.There are still a couple that I need to write up on the board.
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