Even a good pH meter will not provide an accurate result if the electrode and buffer solutions are incorrectly selected for it. It is this connection that most often determines the real stability of measurements in laboratory practice.

Selection must take into account sample type, chemical environment, pH range, intensity of use, and speed requirements. For some laboratories, versatility is critical; for others, resistance to complex environments or high accuracy over a narrow range are critical.

Therefore, the consumables and working elements of the pH system cannot be considered secondary. This is the part of analytics that directly affects the reliability of the result and the everyday convenience of work.