Generally we state that the pH analyzer is as accurate as the care that is given to the device allows.
The official specifications from the GS Sheet are shown below:
Liquid analyzers are used for monitoring process chemistry including water quality, providing process optimization and control.
pH and ORP meters, analyzers and transmitters are used for continuous process monitoring of pH and ORP to ensure water/product quality, monitor effluent discharge, batch neutralization, pulp stock, scrubbers, cooling towers, chemical, water/wastewater treatment and many other applications.
Process analyzers are used to determine the chemical composition or physical properties of substances involved in industrial processes.