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Message: [QUOTE="headfullofbees, post: 206693, member: 408"] No There is a natural potential difference between two metals; say copper & zinc, which is why they often have two probes, & is why they do not need batteries. (The one you show still has two detectors but they are both within the same probe.) The amount of moisture in the soil will change the conductivity of that potential difference, & that is what shows on the meter. Won't be more harmful than dropping a penny into the soil. Welcome to the forum. [/QUOTE]