Sony feedback scales - high accuracy optical scales for closed loop feedback applications.   SH10A (optical slim casing A/B output) SH50 (optical A/B output) SH11 (optical A/B output, higher accuracy) SH12 (optical, slim casing, 1v p-p output) SH52 (optical 1v p-p output) SA55 (optical semi absolute) SA57 (optical full absolute)