ISFET
The ISFET (ion-sensitive field-effect transistor) used to measure ion concentrations in a solution; when the ion concentration (such as H+, see pH electrode) changes, the current through the transistor will change accordingly.
Field-effect transistor Website
All about Field-effect transistorThe ISFET (ion-sensitive field-effect transistor) used to measure ion concentrations in a solution; when the ion concentration (such as H+, see pH electrode) changes, the current through the transistor will change accordingly.