Festo offers actuators with feedback, both rotary and linear. The linear potentiometer is a component of the controlled systems—it supplies the actual value with the current position. Potentiometers or contactless linear potentiometers are used. The linear potentiometers are integrated in many pneumatic actuators. Alternatively, they can also be attached to the actuator. The cylinder diameters vary from 18 mm to 100 mm, the stroke lengths from 100 mm to 2,000 mm.