Phoenix Engineering Falcon PSU Turntable Speed Controller for AC motors 100-240v Dimensions: 3.565"L x 2.50"W x 1.1875"H. Weight: 4 oz. Speed Adjust: 1.0 RPM in 0.1 RPM steps Normal Mode, 1.0 RPM in 0.01 RPM steps Calibration Mode Distortion: Less than 0.5% Min Freq Step: 35Hz Freq Stability: Crystal Controlled 100PPM