An ion meter is an electrochemical analytical device that is used to measure ion concentration in a solution. It is used with several ion electrodes (ISE).
An ion is an atom or a group of atoms with electric charge. This charged particle can be positive or negative. A cation is an ion with positive charge and an anion is one with a negative charge (atom or molecule). The ions are formed when a neutral (electrically neutral) atom loses or gains electrons. The anions have more electrons than protons and cations have a higher proton number.
Measuring the concentration of ions or measurements of specific ions through an ion meter can be performed in a wide variety of samples such as water, food, beverages, pharmaceutical products and samples of biological origin.