Backed by proprietary Swiss sensor technology and materials, Apera LabSen 211 Glass-body pH Electrode is ideal for precise pH measurement of general water solutions in scientific research and quality control. This electrode is compatible with TRIS buffer solutions. Unique LabSen blue glass membrane faster response time, better repeatability, and built tough, highly resistant to general impact (totally differentiates from the traditional fragile glass bulb membrane); and can be tested in high temperature samples (up to 225F). Long-Life Reference System - composed of a glass tube, AgCl and a reference silver wire. The top end of the slim glass tube is stuffed with cotton, which prevents the reaction between AgCl and electrolyte when temperature changes. It improves the stability of reference electrode and prolong the service life of the electrode. Housing Material: Lead-free glass; Temp. Sensor: No; Junction: Ceramic; Reference: Long-Life; Electrolyte: 3M KCL; Length: 120mm; Diameter: 12mm; Membrane Shape: hemispherical; Range: 0-14 pH; Temp. Range: -5 to 100C (23 to 212F); Connector: BNC; Cable: 3 Ft. The electrode uses a BNC connector, compatible with any pH meters that use standard BNC sockets. Temperature sensor is not built-in. Users need to have a separate temperature probe to enable ATC or manually input temperature to realize temperature compensation. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.