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Originally Posted by J_Player
From what I see in their pictures, there are several ways false signals could cause a voltage variation at the meter that have nothing to do with a target. In order to eliminate the possible voltage errors, here are some precautions that you could take to save yourself a lot of time contending with intermittent false readings:
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Exactly. There is no mystery here, except in Hung's overactive imagination. If you take any digital multimeter, and set it to to a low mV range, there will be some low level intermittent readings if the leads are left dangling. After a short time the meter will settle at 0V, but even bringing your hands close to the meter leads will give a small reading. You will note that in all the images posted by Hung, that someone is physically making contact with the meter leads. The mysterious meter readings are nothing more than measurement error.