The dawn of modern civilization was characterised by the electronic industry. During the last few decades, electronics have made tremendous advances. Electronics did not spare to enter any of the human environments like laboratories, houses, etc. The majority of the laboratory instruments are mostly electronic in nature.

The pH metre is one such instrument among the vast array of electronic instruments. The adherence and determination of certain pH values are very important, particularly in catalytic processes. pH metres have varied applications, and the determination of the pH value of solutions is very important. Man always seeks ease and comfort and does not want to waste time and energy. Quick and accurate operation and reading of an instrument are essential for him.