Extend the current/voltage range of the Zennium series potentiostat. The external potentiostats are controlled via an EPC42 interface card and can perform all electrochemical measurements possible with the Zennium series potentiostat. Multiple external potentiostats can be simultaneously connected with a Zennium series potentiostat and controlled sequentially. Zahner's electronic loads are specially designed to perform reliable and clean impedance spectroscopy at high currents. With an external power supply, the setup can be extended to a two-quadrant setup for the field of electrolysis.