We have not needed to re-calibrate our pH meters for over 3 years!
Electrode cleaners are usually made from acids, alkalis or chelates. However, these chemicals are largely ineffective for cleaning electrodes that have been contaminated by nutrient solutions.
Flairform's Electrode Cleaner is designed specifically for use in hydroponics. In many situations, Electrode Cleaner eliminates the need to re-calibrate.
Electrode care: Avoid placing electrodes in oily solutions as they can “coat” the electrode. Further, avoid measuring (or leaving electrodes for too long) in harsh chemicals. For example, highly caustic or concentrated solutions such as raw nutrient, pH Up and silica additives.