If you have any questions please reach out to us. Repeatability ± 0.1 percent of set point. 501 with digital tachometer feedback. New acrison 060 scr-dc variable speed dc motor controller 115-230-vac 1/8-1-hp input voltage 115/230 vac (± 10%) 50/60 hz. For 1/8 to 1 horsepower DC motors.