The SensoRex pH Electrode pH 16Y991 is a gel-filled, combination pH electrode with a glass body and epoxy body gel filled reference. It has a 12 mm diameter pH bulb and internal Ag/AgCl reference electrode. The electrode has a BNC connector and 1 m cable. It has a 3/4" NPT thread mounting and is suitable for laboratory, industrial, and municipal water applications. The electrode has a pH range of 0-14 pH, temperature range of 0-80°C, and reference impedance of <300 MOhm.