Taiwan alpha 11mm optical rotary encoders 25mm flat metal shaft 15ppr taiwan alpha re111f 20b3 25f 15p this incremental optical rotary encoders has horizontal terminals and a resolution of 15 pulses per revolution with 30 detents per revolution the encoder has a long operating life and is suitable for applications that require precise shaft unlimited rotation taiwan alpha 11mm horizontal encoder 25mm flat metal shaft 15ppr