Stouffer Platemaker's 21 Step Gray Scale

21-Step transparent scale for plate making, contact printing and photo processing. Steps are progressively more dense in increments of 0.15. Made in accordance with GATF specifications.

The Stouffer 21-Step Transparent Guide is heralded around the world as "the platemaker's choice". It serves as a gauge to evaluate the variables encountered in the exposure and processing of lithographic plates and photographic materials by contact. It indicates the direction and magnitude of exposure or processing adjustments necessary to achieve the desired results. It is also used with contact positives, silk screen, printed circuit boards, and most other photographic applications for judging results, determining speed and contrast of emulsions, and hardness of coatings.