All advantages of the magnetic measurement principle are available by using magnetic rings for rotary movements e.g. revolutions -, angle or extent measurements also. Besides the magnet rings are a wear-free and space-saving alternative to optical rotary encoders and are insensitive against dirt, dust, liquids and vibrations also. For scanning these magnet rings the conventional ELGO incremental measuring systems are useable. The ring, provided with a magnetic pole division (north/south poles), is scanned contactless with a magnetic sensor system. At present three different standard magnet ring sizes (see technical specifications also) are available.