potentiostat

https://doi.org/10.1351/goldbook.09079
Measuring instrument for electric current that controls the potential difference between a working electrode and a reference electrode and measures the electric current between a working electrode and an auxiliary electrode.
Source:
PAC, 2020, 92, 641. (Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)) on page 654 [Terms] [Paper]