Air Screen Machine
The Air Screen Machine grades seed three different ways:
1. Using negative air to remove dust and other particles.
2. Sifting out thins.
3. Scalping larger material such as stones and weed seeds.
Indents
Indents grade seed by length, removing longer or shorter seeds.
Gravity Tables
Gravity tables separate seeds by density, removing stones, as well as heavier or lighter grains.