Ion-selective electrodes (ISE) are pH laboratory electrodes that determine the concentration of specific ions. Choose from cost-effective ion-selective electrodes and solutions to combination ion-selective electrodes featuring both half-cell and reference cell in one electrode. To get the most out of your electrodes, rinse between samples with distilled or deionized water and gently blot with a lab wipe. Never wipe. Do not store electrodes in distilled or deionized water.