The Ivium Technologies uMUX multiplexer can work individual cells with 2, 3 and 4 electrodes and a WE2 (BipotentioStat, optional). It has 8 channels and multiplexer units can be stacked so that up to 64 channels can be controlled sequentially by a single potentiostat.
In the uMUX each channel switches with relays and can be used with any Ivium potentiostat, including the 50V and 100V versions. The uMUX has the advantage of a lower price than the HiMUX.XR. Automatic channel selection is integrated in the software.