Thermo Scientific 910001 Orion pH Electrode Storage Solution is for electrode storage and use as a rinsing and cleaning solution. Solutions restore proper electrode performance and prolong the useful life of the electrode. Orion storage solution ensures that the pH electrode works properly after prolonged storage, overnight storage and in between samples. Orion storage solution is a colorless liquid to easily identify it from other color coded pH solutions. Specific gravity: 1.05. Boiling point: 100°C. pH: 6.3 to 6.9.