Position measure Optical rotary encoder

{"cid":"117736","pid":"22127735","pimg_url":"\/\/img1.b2bforus.com\/68\/aa\/a0c38ca45240\/product\/74422192_s-w400xh400.jpg","name":"200-201-1 200PPR Nidec Copal Optical Rotary Encoder RE12D Alternative Instead","attrs":{"Price":"Negotiable","MOQ":"1.0 Pieces","Delivery Time":"Negotiable","Brand":"ODM"}}