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The article focuses on pH measurement. The acidity or alkalinity of solutions is indicated by a pH value, which it is important to control in many chemical and biotechnical processes, especially in water and wastewater treatment. The significance of pH in industrial processes lies in the fact that many phenomena, such as flotation, precipitation, precipitation, and coagulation, occur in a certain pH range. The inhibition of corrosion is another application of pH control. In industrial applications of biotechnology, such as fermentation, the pH is an essential factor in the growth process. The neutrality of pure water is an important factor in human life.