If I hold one lead of my multimeter to my left index finger, and the other lead to the right index finger, it gives a reading of around 30mV. The reading quickly drops when I leave it there. I tried measuring the voltage between myself and the ground and it read 0mV. Whats stranger is that if I hold the positive lead to my left finger, and the negative lead to my right finger, it gives me a negative reading and vice versa. Its like my left hand is a positive battery terminal and my right hand, a negative terminal. Whats going on here? I tried dipping my fingers in salt water but that didn't affect the reading. I measured the voltage between my tongue and finger and it gave a lower reading (around 20mV). Measuring between my thumbs gives a higher voltage (around 40mV). Like I said, the voltage starts dropping when I hold it there so the only theory I have right now is that theres negative charge building up in my right arm or hand and then when I apply the voltage to the multimeter. Any idea what the cause of this is? Also, can you try this yourself and tell me whether its the same for you or its just me. I had an operation on my right hand a few years ago and now my right hand gets less blood flow than the left one.