These ion-selective half-cells (exception: Sodium-sensitive electrode) consist of two elements: a universal shaft and an ion-specific membrane module.

• Available as half-cells (require external reference electrode) or as electrodes with built-in reference
• Each ion-selective electrode (ISE) and each membrane module is tested wet-chemically
• Each ISE is issued with its own serial number and quality certificate
• Electrodes are filled with electrolyte and ready for use
• Membrane kit comes with an identification ring (ID ring) and an adapter sleeve which will fit any METTLER TOLEDO titration stand

This module may be exchanged allowing users to measure the ion of their choice. They just need to order the membrane kit specific for that ion, mount the new module onto the shaft of the ISE half-cell, and they have a new ISE.