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pH meter and measurement technology

Introduction to pH - Excellent overview of pH and pH measurement at the Omega Engineering website

The story of pH made easy  - An introduction to the basics of pH and pH measurement

www.ph-meter.info- Theoretical and practical information about pH meters

The Beckman pH Meter  - National Historic Chemical Landmark of the American Chemical Society

CurTiPot software - All-in-one freeware for pH and acid-base equilibrium calculations and for simulation and analysis of POTentiometric TItration CURves