The MSA-21 is a highly advanced galvanic skin response testing device used to conduct a comprehensive meridian stress assessment. The MSA-21 provides an extraordinary new perspective on the overall state of the body’s health. Once the initial evaluation is completed and the patient’s imbalances are identified, then the system’s extensive database consisting of thousands of herbal, homeopathic and nutritional remedies can be accessed to determine the best product possible for balancing the body.