1) Dual jacketed model allows you to draw vacuum from the outer jacket, thus protects your recirculating fluid temperature and gives you best control over your work. It also help prevents frost to form on the outside of the vessel, allowing you to see clearly into your material. 2) Solvent-resistant PTFE on all sealing components ensures long time durability and operation. 3) All glassware is hand-made from food grade high borosilicate glass that is heat/cold/corrosion-resistant. 4) Adjustable stirring rate provides great torque or high speed. 5) Patented PTFE stirring rod bearing for reliable and quiet operation. 6) Optional multi-layer stirring blades for optimal reaction results. 7) Wide range of temperature operations, from -110°F to 400°F. 8) Large condenser cooling surface for exceptional condensation performance. 9) Rugged stainless steel reinforced PTFE stirrer with anchored agitator, suitable for a wide range of viscous materials. 10) Easily visual operation with digital speed and temperature displays. 11) Heavy duty stainless steel supporting framework with lockable casters for mobility and stability.