The Grainger Approved pH Electrode is a combination electrode designed for general purpose pH measurement in the 0-14 pH range. It has a glass body, gel-filled reference with Ag/AgCl reference wire, BNC connector, and epoxy body. The electrode has a response time of less than 10 seconds and is compatible with pH meters that accept BNC connectors. It requires storage solution and regular calibration for accurate pH readings. The electrode measures 12" length x 0.5" diameter.