I watched your interesting video twice. Thank you!
It was a nice try I should say. However, I also should say that the bio-electric signal,claimed to be detected by the device, is everywhere in your body. It can be generated in the brain, heart beating and muscle constructions because it is the way how a living thing works, that is, every movement is controlled by bio-electric signals.
When you use your fingers to pitch the sensor, the muscles in fingers construct and these muscles generate electric signals and that might be detected by the device. This might be a good thing since it means the device is sensitive.
It is interesting to watch that you use a wire to connect the sensor. I ask you to do the following test and answer me the results if you don't mind. After the wire connection is made, you just leave the device there without any touch with your fingers to see if the screen showing any signal. Then, you use finger to touch the wire to see if any signal shown in the screen. If no for the first situation but yes when the finger touches. The result is good because that means all signals are from your fingers that bring bio-electric signals derived from the muscle movements and firing of neuron fibers in your fingers.
Good luck!
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