Macro Precise WPI (Wraps per inch) tool - easy to hang from your wheel or stash in your spinning bag to check WPI as you spin.
To calculate WPI wrap your yarn or single comfortably between the 0 and 1/2 (not loose, not tight). Multiply the number of wraps by 2 to calculate WPI.
Contains 10 lines to quickly approximate your WPI by lining up your single or plied yarn to the matching line. Guide lines for 20, 24, 28, 32, 36, 40, 48, 56, 64, 80.
This WPI tool is made from 1/8" cast acrylic.
Dimensions: 1.75" x 3.375" inches
The listing picture is a representative sample of the WPI tool offered.