I don't have any direct experience with these devices, but I do understand the principles - it is essentially the same as is done internally within consciousness once our intent internally is to heal and we have made the unconscious conscious within us. In such a state of being there is no use for technology, since we are able to effect the frequencies of self directly.
I'm not aware of any scientific studies done into what I am describing that speak in these terms, but there are numerous examples of people doing it.
I imagine the frequencies of the dead pathogens were detected because, as I said in the other post, non-physical proceeds physical - so physically killing something does not necessarily remove it's imprint from the essence involved.