Speed controls for motors are normally supplied with a rotary potentiometer for adjusting speed. This is especially true for DC motor controls. Motor speeds are difficult to set with precision, and most definitely these settings are not repeatable from day to day. Dart Controls has released its line of DC controls with integral, digital pushbutton speed potentiometer. Speeds can be adjusted in increments as small as 0.1% and digital circuitry ensures repeatability with every use.