The Dupla pH Electrode Set 2.0 contains a high-quality glass electrode with exchangeable electrolyte and BNC connection as well as calibration solutions. The correct pH value is crucial for a beautiful aquarium with healthy fish. This is because the acidity level determines the pH value of the water. You should therefore check the pH value regularly and, if necessary, adjust it to the respective needs of the inhabitants of your aquarium. An incorrect pH value means stress for the animals and can cause diseases. The Dupla glass electrodes are characterised by their especially high and reliable quality. The verified quality allows the most accurate measurements, which are also appreciated by laboratories. It also guarantees a long and trouble-free service life. Thanks to the BNC connection used, the glass electrode is compatible with all Dupla pH controllers as well as with almost all other commercially available pH controllers. The electrode comes with all liquids necessary for calibrat