In an automation system, the most necessary measured variable is displacement. When upgrading of system, a high accuracy displacement transducer is needed. Magnetostrictive displacement transducer is developed as a result of attending to need like this. Model GY Series are “Displacement Transducers” employing magnetostrictive phenomena, especially the Wiedemann effect. An ultra-sonic wave is generated by a moving magnet operating near a magnetostrictive wave guide on which the sonic wave propagates up to the head of the transducer. The propagation time is precisely measured by state of the art technology and then the absolute displacement transducer is operational.