PH meter

Beckman Model M pH Meter, 1937[1]
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.[2] 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.[3] Testing of pH via pH meters (pH-metry) is used in many applications ranging from laboratory experimentation to quality control.[4]

  1. ^ "Beckman Coulter Product Milestones" (PDF). Beckman Coulter. Archived from the original (PDF) on 2017-04-06. Retrieved 5 April 2017.
  2. ^ "pH meter". Encyclopædia Britannica Online. 2016. Retrieved 10 March 2016.
  3. ^ Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.), ed. Richard Cammack, Teresa Atwood, Peter Campbell, Howard Parish, Anthony Smith, Frank Vella, and John Stirling, Oxford University Press 2006, ISBN 9780198529170
  4. ^ "pH Measurement and Value". Global Water. Xylem, Inc. Retrieved 21 March 2017.