Nib Grader - Measure My Pen Pad

This business card sized fountain pen nib grader is made of thick, clear acrylic.  On the clear plastic pad are printed silver measurement lines in different size. The tool is designed to be laid on top of a line written with a fountain pen to determine the grade or thickness of the nib. "Find out the thickness of your fountain pen nib".  Made by Dominant Industries. 85 x 50 x 3 mm