Electrode and Probe Cleaning Solutions - Used to clean meter tip. Works for both pH and conductivity meters. Comes as a two part A and B cleaning solution to remove both organic and inorganic deposits from meter sensors. Use monthly or as needed to refresh your meter and keep it working optimum. Soak tip in part A for 5 min, then part B for 5 min and then back in part a for 5 more minutes and rinse with tap water. pH Electrode Storage Solutions - Use to store your pH meter electrode between uses. This solution is designed to keep your electrode sensing membrane and reference junction clean and unclogged and ready for use. Store your electrode directly in a small cup of solution or saturate a sponge in the cap of your meter for storage between uses. This will prevent your permeable glass membrane from becoming dry and from mineral deposits clogging the surface. This solution is designed to equalize the osmotic pressure of the reference solution in your meter junction to keep the reference solution from seeping out and prematurely aging your meter. Should your electrode membrane dry out soak it in this solution for at least two hours before use. NEVER STORE AN ELECTRODE IN DISTILLED OR DEIONIZED WATER.