Main Specifications ? Shaking : 60 ~ 250rpm ? Controller : Digital feed-back Control ? Accuracy : within ± 1 rpm ? Platform : JSOS-500 500 x 500 mm ? JSOS-700 700 x 600 mm Precise Temp.& RPM Control Integrated microprocessor digital Feed-back control provides precise speed control. Equipped with wait-off timer, alarm, auto-tuning, in-built rpm calibration Feed-back logic control system provides shaking speed accuracy within ± 1 rpm and maximum up to 250 rpm Dual digital LED displays PV and SV value. Displays temp., rpm and time alternatively