Backed by proprietary Swiss sensor technology and materials, Apera Instruments LabSen 331 POM-body pH Electrode is designed for testing complex water solutions such as wastewater, emulsion, suspension, and solutions containing protein and sulphide. The POM body of the electrode makes it highly resistant to various kinds of corrosions. Polymer Electrolyte – The solid polymer electrolyte is in direct contact with test samples. The anti-pressure capacity can reach up to 6 bars, making it ideal for testing suspension and wastewater. No more frustrating clogged junctions. Long-Life Reference System – LabSen 331 pH electrode adopts a long-life reference system, which is 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: POM; Temp. Sensor: No; Junction: Double-Pore; Reference: Long-Life; Electrolyte: Polymer; Length: 120mm; Diameter: 12mm; Membrane Shape: hemispherical; Range: 0-14 pH; Temp. Range: -5 to 80˚C; Connector: BNC; Cable: 3 Ft; LabSen 331 uses a standard BNC connector, which is compatible with any pH meters that use BNC connectors. Temperature sensor is not built-in. Users need to have a separate temperature probe to enable ATC or manually input temperature value to achieve temperature compensation. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.