operational pH cell 

https://doi.org/10.1351/goldbook.O04298
An electrochemical cell which is the basis of practical pH measurement consisting of a hydrogen ion-responsive electrode (hydrogen gas, or glass) and a reference electrode immersed in the test solution.
See: pH (in analysis), reference electrode (in analysis), test solution (in analysis) (in analysis)
Source:
PAC, 1985, 57, 531. (Definition of pH scales, standard reference values, measurement of pH and related terminology (Recommendations 1984)) on page 540 [Terms] [Paper]
Citation: 'operational pH cell' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.O04298 RIS BibTex EndNote
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Last revised: February 24, 2014