Fast, Accurate Determination Of Checkering Size
Easy-to-use template identifies checkering spacings from 16 to 32 lines-per-inch. Place over pattern to be measured and match the lines on the proper scale. Oblique diamond shape helps provide accurate determination of layout lines.
Big Book Catalog, Issue:69, Page:412
SPECS: 9" (22.9cm) x 2¾" (7cm).