Backed by proprietary Swiss pH sensor technology and materials, LabSen 241-3 Micro pH Electrode is designed for micro-volume samples (≥30 microliters) such as microplates, microcentrifuge and microbiological samples. Unique LabSen slim glass membrane - 4mm in diameter (sensor tip 3mm), 70mm in length, making micro-sample pH testing easier than ever, and can be tested in high-temperature samples (up to 212°F). The stainless steel sheath ensures the durability of the slim glass tube. 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 the temperature changes. It improves the stability of reference electrode and extends the service life of the electrode. The electrode uses a BNC connector, compatible with all pH meters that use BNC connectors. The temperature sensor is not built-in. Users need to have a separate temperature probe to enable ATC or manually input temperature to achieve temperature compensation. The product is CE and RoHS certified and is manufactured under an ISO 9001: 2015 certified quality system.