Handle electrode with care - it is fragile!
Keep electrode always immersed. Use the solution recommended by manufacturer or neutral solution of KCl (3M-4M).
Remember to always keep internal level of filling solution above the level of measured solution.
Fill electrode (the flowing type) with correct filling solution (as recommended by manufacturer - usually KCl solution, 3M to saturated) to not let it dry internally.
If the electrode will be not used for a long period of time, you may store it dry to prevent aging (aging takes place only when the electrode is wet). Don't try it with gel electrodes - these have to be stored in concentrated solution of KCl only.
If dried incidentally, or after storing - soak for at least 24 hours before using.
If you are using the electrode in solution containing substances able to clog the junction or stick to the glass bubble, clean the electrode as soon as possible after use.
Don't put electrode in solutions that can dissolve glass - hydrofluroic acid (or acidified fluroide solution), concentrated alkalies.
Don't put electrode into dehydrating solution such as ethanol, sulfuric acid, etc.
Don't rub or wipe electrode bulb, to reduce chance of error due to polarization.
Don't use organic solvents for cleaning of the electrode with epoxy body.