The Endress+Hauser Tophit CPS491 is a ISFET electrode for heavily polluted media in chemical processes, paper or paint production. The Tophit CPS491 is the analog specialist for fibrous media or media with a high content of suspended solids such as dispersions, precipitation reactions or emulsions. Its unbreakable shaft ensures a long operating life while the open aperture prevents fouling and guarantees reliable measurement under harsh process conditions.