Magnetostrictive BackPack Feedback bolts to pneumatic cylinder, detecting position of piston magnet. It attains resolution exceeding 0.2 µm, linearity of ±0.02%, and hysteresis of 0.0001 in. Autotuning electronics adapt to various cylinder styles, and to temperatures fluctuating in -40 to +185°F range. IP 67/CE-approved sensor resists shock and vibration, and has reverse polarity protection.