ISFET sensors are made of unbreakable PEEK and are available with three different reference systems, providing a glass-free pH sensor to suit every requirement. The sensors are equipped to meet the strict demands of hygienic applications. Because of their new design, with an increased chip surface, they are easy to clean. They deliver stable and reproducible measured values, even after sterilization and autoclaving up to 275 °F (135 °C); come with the usual hygienic approvals for the food and life sciences industries, such as USP, EHEDG and 3A; and are TSE/BSE-free. They can last at least 25 CIP cycles - a significant improvement in CIP stability compared to conventional ISFET sensors. In addition, the Memosens CPS77D offers maximum bacteria tightness because of its microporous ceramic diaphragm.