A pH measurement determines the concentration of hydrogen ions in solution.
Further testing is required.
A common problem with the pH measurement is the lack of proper maintenance of the total system. The electrodes need to be calibrated for each use, and the temperature must be accurately maintained. Along with using the proper equipment, a fully trained technician is essential to obtaining useful results. Specific gravity measurements are useful to demonstrate that the proper dilution has been made. However, if used alone, this test is not specific enough to determine whether critical components, such as developer anti-foggants, are missing or removed from the solution.