These vacuum drying ovens are specially designed ovens suitable under vacuum at constant temperature of ambient to 220℃. They are double walled in construction, the inner being made of STS 304 Stainless steel (3T) and the outer of SCP-1 with powder coating. The space of two walls is sufficiently insulated with high quality Ceramic Wool to prevent any undue loss or gain of temperature. There is tempered safety glass window on the door to maintain vacuum and to observe easily your sample. For the perfect vacuum silicon packing is used and this silicon packing has a long durability nevertheless long use. In this oven, the two screw vacuum valve is enable to make vacuum and operate N2 purge at one time. And also, these ovens have a digital PID controller with auto-tunning , temp. controller and time controller function.