Question about ELECTRODERMAL SCREENING and frequency medicine

I go to a health food store that does ELECTRODERMAL SCREENING. He has you put your hand on a device and the computer reads out what is unbalanced in your body and what you need. He takes a brown bottle and puts some alcohol and water in it and puts it in a device and has you put your hand on it and the computers frequency is putting what you need in the bottle. He calls it frequency medicine. Anyone ever heard of this? My question is how does a can a computer put herbs in the bottle. The computer says what your body agrees with there are several to pick from and he will pick the best one that agrees with you. He says its the same products that is in his store. Anyone ever heard of this? If so I/m just curious if this is for real.