ZYTO Technology developed the Compass Scan software which uses galvanic skin response to measure subtle shifts in electrical conductivity on the hand or body. When used with the hand cradle interface, the Compass Scan analyzes the body's responses to stimuli to determine which of hundreds of pre-loaded nutritional supplements the body biologically prefers and may help bring biomarkers into balance. The purpose is to provide practitioners an additional tool to help select targeted supplements for patients' needs. Case studies and testimonials suggest it can accurately identify supplements related to current health issues.