 We're now going to read the pH of the calcium hydroxide solution. I'm going to take the pH probe out of the storage solution, rinse it with some distilled water, and I'm going to place it into a saturated solution of calcium hydroxide. I'm going to read the pH from the CBL screen. I'm going to rinse off the probe and return it to the storage solution. We're going to take our pH probe out of the storage solution. We're going to put it into a saturated solution of magnesium hydroxide. We're going to read the pH off the CBL. We're going to remove the probe from the solution, rinse it with distilled water, and put it back in our storage solution.