Micro 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 s
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Great card with more detail than the other one I had. So much better than trying to count wraps.