• POLISOLVE PLUS reference allows highly reproducible and stable measurements over long periods of time • Minimal diffusion potential • 2 SINGLE POREs for direct contact between POLISOLVE PLUS electrolyte and medium • HAMILTON “H“ pH glass, stable for long periods plus a patented reference system • Upside-down mounting possible • Monitoring of all sensor functions, status of the sensor quality (glass resistance, reference resistance)