Wraps Per Inch (WPI) Tool Kit -Q
This clever tool and Knit-Kard enable users to measure the thickness (weight) of their yarn. The tool is a wooden device which has a laser etched legend on it which the user wraps their yarn around. Then they know the WPI for that yarn. The handy WPI Knit Kard (which is only available when you buy this tool), then tells the user what the weight of their yarn is based on the WPI. We have sold many tens-of-thousands of this tool since its inception in early 2000. Visit the WPI webpage.
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