Ideally, how often should a pH meter be calibrated?

The ideal frequency for calibrating a pH meter is before each use. This ensures that the readings taken are accurate and reliable, as the calibration process counteracts potential drift that can occur due to factors such as changes in temperature or electrode wear. Calibrating just once a day may not capture variations that could occur throughout daily measurements, especially in an environment where precision is crucial. Doing so before each use guarantees the highest level of accuracy and consistency, allowing for more precise environmental monitoring and compliance assessments.