ELTRA EL721A500Z5L10S3PR0,5+M Incremental hollow shaft encoder with fixing holes (diameter 63?5 mm). Size: 72mm. With zero pulse. Res.: 500 ppr. Power Supply: 5 V DC. Line Driver. 10 mm (diameter of shaft). Enclosure protection: IP 66. Maximum Rotation speed: 3000 rpm. Radial cable output. Series specially designed for direct mounting on tachometric dynamos or motors.