relative electrode potential

https://doi.org/10.1351/goldbook.R05264
The electrode potential of a single electrode is not amenable to direct experimental determination and can only be measured against a reference system. The measured quantity, E, is the relative electrode potential.
Source:
PAC, 1986, 58, 955. (The absolute electrode potential: an explanatory note (Recommendations 1986)) on page 956 [Terms] [Paper]