proofer

noun3

1. •
   A chamber used in baking that encourages fermentation of dough by yeast through warm temperatures and controlled humidity.
2. •
   One who proofs.

   • There was a time when the half-tone photographer received considerable more in wages than did the proofer. — 1913
3. •
   A printer used to make proofing copies that look like how it will come out of the press.

   • In graphic arts industry, in order to utilize color effectively, often a proofer is employed to simulate the reproductions of a press that is used to produce high-quality printed matters for clients. — 2003