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Potentiostat, galvanostat and zero resistance ammeters are some of the most common types of instruments classified as electrochemical instrument. For example, a potentiostat is used to control the voltage difference between a working electrode and a reference electrode both of which are contained in an electrochemical cell. Likewise, galvanostat is an instrument that controls the current through an electrochemical cell at a preset value. Thus, electrochemical instruments are used for various purposes in electrochemistry.