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Originally Posted by Esteban
Only wish comprobe is a fet can be supplied by few milivolts. And, of course, similar battery can show metals in soil.
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Interesting experiment. You found that the moisture content would determine how much voltage could be detected from the battery, which could be used to extrapolate to how voltages produced by "ground batteries" can change when the moisture content of the ground is changed.
Best wishes,
J_P