En muchos casos, no es necesario realizar calibraciones anuales.
If the measurement requirements are high, there are more impurities and dirt in the fluid, and the environmental conditions are poor, the electrode is fouled, which affects the measurement, cleaning, and the measurement is inaccurate after repair. It can be calibrated.
Si las condiciones de trabajo son buenas y el uso a largo plazo es normal, no es necesario calibrar anualmente.