Lincoln Service Parts 1 › Lincoln Electric 9SM17789-28 ENCODER, OPTICAL, 2-BIT, 24 POS, PB M17789-28 Lincoln Electric 9SM17789-28 ENCODER, OPTICAL, 2-BIT, 24 POS, PB M17789-28 Sale Price: $103.17 Original Price: $118.65 ENCODER, OPTICAL, 2-BIT, 24 POS, PB PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! ENCODER, OPTICAL, 2-BIT, 24 POS, PB PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1