A 21-step steptablet is essential for BTZS film and paper testing. Ours is 4x5 inch and fits your enlarger or over the film for contact printing.
Instructions for using a step tablet for both film and paper, are available for viewing or may be downloaded to your desktop:
Download Steptablet Instructions
Manufacturer: Stouffer Industries
SKU: TP4x5-21
Unit of Measure: 1