Abstract: An electro-pneumatic calibrator to be used in testing and calibration of electro-pneumatic devices having the capability of generating or measuring air pressure in psi, current in milliamps or voltage and measuring air pressure in inches of water or resistance in ohms. A plurality of separate digital meters allow simultaneous use of the separate functions. The apparatus includes a switch and two potentiometers which allows setting variable zero points and spans when the apparatus is used to generate a current or voltage and quickly switching between the set zero point and span.