Electronic tongues have been involved in the revolution of the traditional chemical sensing of liquids. The concepts of sensitivity and selectivity have started to assume different meanings, adapting to a new approach to the fingerprinting of complex liquid solutions. Electrochemical transducers are the most widely exploited read-out mechanisms for arrays of sensors that transform a chemical information into an electrical one, more manageable and easier to interpret. With respect to the voltammetric and amperometric techniques, that require dealing with moderate voltage and current values, potentiometry demonstartes to be the most suitable sensing method, compatible with the miniaturization and portability objectives of those types of devices.