hello ! i think you dont understand me well homefire , what i was speaking about is the compass depth doubler , the box run with a car battery and ou put soome electrodes in the area you wanna hunt , the system send current into the ground and reach deeply all things are into the ground , the current boost the halo of the thing and allow your MD to see deep .
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http://compass-metal-detector-forum.548136.n2.nabble.com/Depth-Doubler-Manual-tt4407630.html#a4407630
the manual :
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http://compass-metal-detector-forum.548136.n2.nabble.com/Compass-Depth-Doubler-device-td5288013.html
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http://www.thunting.com/smf/index.php/topic,65240.msg318495.html#msg318495
AK48