The SSI interface is used with double or triple reading to secure reading even in noisy environment.The rotational encoder can be delivered as a magnetic based low cost version with 1 degree error or a high precision optical version with 0.05 degree error. Magnetic Linear encoders have precision down to 50µm and can therefore be used for high precision application at a low cost. Thereby the cost for sensor and mounting time is saved Another major reason for using absolute encoders is to correct motor position in relation to the actual physical absolute position measured. In addition, with its obvious advantages, the Magnetic measurement system is a valid alternative to traditional linear and rotative transducers. The system operates without contact and is unaffected by dirt, grease and water.