1. cuboid chamber maximizes the effective cubage.microprocessor controller for temperature ensures a precise and reliable control. 2. dual-layer bulletproof toughened glass door ensures absolutely clear observation on objects in chamber. 3. shutting extent of oven door is adjustable. closed-cell silicon gasket ensures a high vacuum degree in oven. 4. the chamber is made of stainless steel(or wire-drawing sheet),which allows a durable service. 5. storage,heating,testing and drying are all in an enviroment without oxygen or filled with inert gases,which ensures no oxidation. 6. minimum heating time is over 50% less than that of traditional vacuum drying oven.