Available with ball diameters from 16mm to 75mm, and offering sealing up to IP65, the Cursor Controls range of Mechanical Trackballs incorporate tried and tested technology and assembly techniques that have been utilised in the field for in excess of 70 years – making them the ideal choice for a host of high specification applications. The ball motion is tracked using dual channel photo interrupters in combination with high precision, stainless steel, shaft encoder assemblies.