Abstract: An apparatus and a non-invasive polygraphic diagnostic method electroautonomography are described. The invented apparatus can be used for diagnostic test to determine the function of the autonomic nervous system (ANS) of major organ systems. Further more, the invented apparatus and related test methods are used for measurement of the two types of skin potentials i.e. slow waves and fast waves. Since the fast waves displays possible clinical indications of autonomic nerve conduction velocity and other ANS function, the present apparatus and the non-invasive polygraphic method can be used for an early and accurate diagnostic tests for many diseases related to autonomic dysfunction and microneurography.