This is an essential part of your setup.
This is the Standard sensor cable with 2 mm banana connectors for WE, CE, RE and ground including crocodile clips (red, black, blue and green) with a connector (Type TRIAD) to your potentiostat. This cable is usually included in the purchase of a PalmSens2 or EmStat2.
A LEMO and a TRIAD plug or receptacle are easy to differentiate, since the TRIAD plug has a screw thread. These receptacles are found in the EmStat2 and PalmSens2.