... closed heater, simple structure, convenient for cleaning.6. AC induction motor stepless speed regulating, brushless, no spark, long life;7. ... control and reliable electronic speed control, to ensure that the electrical properties. Also, we have 2L, 3L, 5L, 10L, 20L, ... . Once cooperation, forever friendship. Welcom to contact with Taikang High quality laboratory instrument RE-2000A Rotary Evaporator