These Actuators have built in Potentiometers inside them so you can determine the position of the actuators at any point in time. The Potentiometers are a Bournes 10 turn Potentiometer with 10K Ohm resistance
A good way to connect the Feedback actuators to a feedback reading device we recommend using an Arduino board. We sell an Arduino kit and we have enclosed an Arduino introduction video here to give you an understanding on how they work.
Using the Arduino board you would be able to define pre-set positional limits for your actuator which can be ideal for certain applications.