... the full closed heater, simple structure, convenient for cleaning.6. AC induction motor stepless speed regulating, brushless, no spark, long ... 7. The system's sealing is very good, high vacuum, high evaporation rate, high return rate;8. The glass instrument adopting GG ... . Once cooperation, forever friendship. Welcom to contact with Taikang High quality laboratory instrument RE-2000A Rotary Evaporator