We have constructed an electronic tongue based on low-cost, ion-selective syringe electrodes, which allows to quantify potassium in a wide range of food products, and pharmaceutical supplements without recalibration. We have also shown how the array can be designed to achieve comparable analytical performance but using less selective ionophores. In this way quantification of potassium is a wide range of real samples is possible not only using low-cost electrodes but also membrane reagents.