What does pH measurement mean in practice?
The glass electrode requires calibration in buffers covering the tested range, a clean junction and time for the reading to stabilize.
When does it matter?
The strips provide an approximate result, and the pH of low-conductivity samples is easily changed by exposure to air and the vessel.
Which solutions are related to it?
A calibrated pH meter is used for technological decisions, recording the temperature and taking the measurement as soon as possible after collection.