pH meter
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~15 min read
Encyclopedic overview
Beckman Model M pH Meter, 1937 Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm
A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode, and so the pH meter is sometimes referred to as a "potentiometric pH meter". The difference in electrical potential relates to the acidity or pH of the solution. Testing of pH via pH meters (pH-metry) is used in many applications ranging from laboratory experimentation to quality control.
Excerpted from Wikipedia’s “pH meter” article, available under the CC BY-SA 4.0 licence.