JBL Proflora pH Sensor Set is a high quality electrode for pH value measuring with cleaning and calibrate solutions. This probe can be connected to th JBL Proflora pH Control unit or all other pH value measuring and regulating systems with BNC connector. The electrode is filled with gel and very sturdy. The kit contains all necessary fluids for calibrating, cleaning and storage of a pH sensor. The pH electrode should be cleaned and calibrated regularly, this increases the life time significantly.JBL ProFlora pH Sensor Set+ pH electrode with cleaning solutions+ robust laboratory-quality pH electrode with BNC connector+ large protective cap filled with storage solution, plastic shaft and gel filling+ suitable for many systems with BNC connector+ individually tested with an individual test reportEvery pH control or measuring device requires a pH electrode to measure the pH value of the water. pH electrodes age with time and must be replaced about every 2 years. Every 30-45 days the pH ele