Dart Controls offers an exclusive line of digital potentiometers that integrate easily with any brand / size / type of motor speed control that accepts a 3-wire speed pot input. The ASP40 display is programmable in any engineering unit including Rate, Time in Process and Percent. The ASP10 is a closed-loop digital pot and therefore DOES require encoder feedback. Typically used in applications where speed/motor load changes are frequent - often used to synch multiple motors in a master / follower arrangement. The digital setting is precise and repeatable - great for modernization of existing installations.