Katrinkles WPI Mini tool (with lines)
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This wraps per inch tool has etched yarn grooves. Measure the thickness of any yarn: Lay yarn into the grooves or wrap it into the inch-wide notch and compare the number of times your yarn fits in the slot with the key. This is also called a Spinner’s Control Card is for measuring the thickness of any yarn.
These lightweight, 2.5" square tools are compact and handy to have along, whether you tuck them inside your knitting bag or hang them from the ball chain loop outside for easy access.