Bante Portable Instruments supply high performance testing equipment designed to be very accurate, reliable and user friendly. Includes pH meters, dissolved oxygen meters, ion meters, ORP and various others. We also supply a wide range of economical Ion Selective Electrodes ( ISE) for determining specific ion concentrations in solutions. An Ion selective electrode is a sensor which converts the activity of a specific ion (dissolved in a solution) into a voltage (potential), which can be measured by a mV or Ion meter. These ions include fluoride, chlorine, sodium, nitrate, calcium just to mention a few.