Variable speed 30 to 300 RPM ± 1 RPM with Digital speed meter. Temp range 5 °C above ambient to 60 °C ± 0.5 °C with glass window. Universal Platform 51 x 51 cm to accomodate 16 flasks of 500 ml. Capacity = 250 lt. And also with hermetically sealed ISI marked compressor placed below the chamber