In this paper we present experimental verification of the reciprocal relation between the ultrasonic vibration potential (UVP) and the electrokinetic sonic amplitude (ESA) effect for colloidal and electrolyte systems. Measurements of the ionic vibration potential at the lower end of the range of concentrations (0.001 M) require correction for the high internal impedance of the solution, while measurements of the ESA effect require correction at the high concentration end because the field applied to the cell is significantly reduced when the cell resistance is low. We also show how the ESA measurements on ionic solutions can be used to calibrate the Matec ESA-8000 device. The resulting calibration constant is in good agreement with that obtained by James et al. (1991) from measurements of a monodisperse suspension of spherical particles.