The Grainger Approved pH Electrode is a gel-filled, combination electrode designed for general purpose pH measurements. It has a glass body and epoxy body material with a single junction reference. The electrode has a 12 mm diameter pH bulb and is compatible with pH 0-14 measurement range. It has BNC connector type and impedance of less than 600 MOhm. The electrode is maintenance free with no refilling required. It can be used for water, wastewater, food processing and other aqueous solutions. The electrode requires a pH/ORP meter for operation.