Introduction:
1. Three slots correspond to three electrodes, namely the working electrode clamp for the counter electrode and the reference electrode
2. The reference electrode and the working electrode clamp are connected through a capillary tube, which serves to protect the electrode and approach the working electrode
3. The counter electrode and working electrode are connected through a glass sand core, which also plays an ion exchange role without affecting the power supply (provided that different liquids are filled in the two studios)