Lincoln Service Parts 1 › Lincoln Electric 9SM17789-27 ENCODER, OPTICAL, 2-BIT, 24 POS M17789-27 Lincoln Electric 9SM17789-27 ENCODER, OPTICAL, 2-BIT, 24 POS M17789-27 Sale Price: $102.02 Original Price: $117.32 ENCODER, OPTICAL, 2-BIT, 24 POS PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! ENCODER, OPTICAL, 2-BIT, 24 POS PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1