Taiwan alpha 11mm optical rotary encoders 25mm flat metal shaft 15ppr taiwan alpha re111f 21b3 25f 15p this incremental optical rotary encoders has horizontal terminals and a push on switch resolution is 15 pulses per revolution and there are also 30 detents per revolution the encoder and switch has a long operating life suitable for applications that require precise shaft unlimited rotation taiwan alpha 11mm horizontal encoder with switch 25mm flat metal shaft 15ppr