Zyto uses galvanic skin response to "survey" the body's energy fields. It measures "response coherence" or biofeedback responses against a database of health parameters (for assessment purposes) and products, which include supplements, oils, and other natural healthcare products. From these readings, the Zyto scan returns a listing of recommended products for a customized natural health and nutrition program.
While this is a popular device at the time of this writing, and ultimately a practitioner's success is the most important marker at all, a challenge with any electrical reading of the skin is that movement alters the assessment. In the case of point probes, this movement is determined by the practitioner, who can then influence readings. In the case of a client's hand placement on an electrical device, even small, unintentional movements can alter readings, as we have found when testing such devices.