What is calibration and why do I need to calibrate my pH meter?

Calibration is done with pH buffer solutions to optimize your reading accuracy.  When you calibrate your pH meter, you calibrate it to work with the particular pH electrode attached, using buffers with pH values that have been confirmed and certified.

Calibration is necessary because it mitigates degradation due to normal use and accounts for the differences between one pH electrode and the next - degradation include the state of the junction and reference cell, while variations include any minute difference in the thickness of the glass in the electrode, the precise porosity of the junction, and so on.


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