Alex. I know it is difficult to do. But you have to accept the fact that you are wrong in your rationalizations.
There is no relationship between the two technologies nor their application. In particular their application.
I am not saying the intent of both technologies is the same, but that they are both measuring in some way the effect of thought as expressed by its affect on the body.
I think an understanding of science and how things work is an important thing. I have a considerable experience in electronics including component level repair and certainly understand the science in this case better than you realize.
If you were to try to understand the underlaying science in the case of both devices, I think you would better understand what I am saying.
I am not saying an emeter is an ekg adapted to disability issues. I am saying both devices measure somehow, thought affecting the body. That is the similarity. They both measure the same phenomenon, although for differing purposes...
thoughts are real, its the things you think that are the illusion
So Alex, what is the "Changing electrical" phenomena that produces an F/N ?
And of course what would be the mental, correlation, or is it a freedom of mental phenomenon, and more of a Spiritual, reach and withdraw ?