1[Composite Electrode] Plastic shell non fillable composite electrode, which is a PH meter measuring elements, which measures the activity of hydrogen ions in aqueous solutions. 2[Glass Electrode] The pH meter consists of a special measuring probe (glass electrode) connected to the body for measuring and displaying pH readings. 3[BNC Connector] With BNC connector, suitable for most pH meters and controllers with BNC, so you can use it with confidence. 4[High Sensitive] PH electrode can improve the response peed, measurement accuracy and stability, corrosion resistance, to meet your various need. 5[Widely Application] Widely used in many situations, such as homes, aquariums, drinking water, swimming pools, aquaculture, laboratories, hydroponics, etc.