I have my own optical cell and fibers. Are they compatible with SPELEC instruments?

Any optical cell is suitable to be used with SPELEC instruments.  Regarding fibers, the connectors in the SPELEC are standard SMA 905 so any fiber with this connection will also be suitable.

Please bear in mind that nevertheless you have available a wide range of spectroelectrochemical accessories including cells and fibers at Metrohm DropSens