Materials of the electrode: gold, Teflon, brass etc.
The gold working electrode (2mm) is as follows:

The most commonly used is 2mm. Gold working electrode of other diameter are also available.
The diameter of the Teflon sleeve is changed with the diameter of the gold.
Diameter:
| Gold | Teflon sleeve |
| 2mm | 6mm |
| 3mm | 6mm |
| 4mm | 8mm |
| 5mm | 10mm |
| 6mm | 12mm |




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