Rotary Vacuum Cooker

Reduced Pressure: By creating a vacuum within the cooker, the boiling point of the sugar solution is significantly lowered.
Controlled Cooking: This allows for precise control over the cooking process, preventing the sugar from overheating and caramelizing too quickly.  
Improved Quality:
Reduced Color: Lower cooking temperatures result in lighter-colored syrups and candies.  
Improved Flavor: The reduced pressure helps to preserve delicate flavors and prevent the development of off-flavors.
Consistent Texture: By controlling the cooking process more effectively, vacuum cookers help to produce candies with consistent texture and quality.
Applications:
Hard Candies: Used to cook sugar syrups for hard candies like lollipops, rock candy, and butterscotch.  
Caramels: Employed in the production of smooth and creamy caramels.  
Fudge: Helps to create smooth and creamy fudge with a consistent texture.  
Other Confectionery: Used in the production of various other confectionery items, including marshmallows, nougat, and some types of gum.