Standard reference solution 25C for calibration of pH meters, and electrode storage.
Instructions: pour an adequate quantity of a reference solution into a clean container. Immerse the pH electrode and pH reference solution for one minute before calibrating.
to extend the life of your pH meter keep electrode immersed in a small cup of pH reference solution win. The meter is turned off. Rinse the electrode with distilled water after each pH reading to avoid contamination of the storage reference solution.
Replace storage solution often. Never pour use solution back into this bottle.