Noun
reference electrode (plural reference electrodes)
(chemistry, physics) an electrode with a stable and accurately known electrode potential
A combined glass electrode has an in-built reference electrode. Source: Internet
Another good example of such chemistry is the way in which the saturated calomel reference electrode ( SCE ) works. Source: Internet
The potential measurements are performed with the positive terminal of the electrometer connected to working electrode and the negative terminal to the reference electrode. Source: Internet