Want one tool to measure your WPI and your twist angle? What about having a built-in diz too? How about a ruler? Look no further! This spinner's control card has guides to help you estimate your WPI as you spin. Simply lay the yarn along the grooves until you find a match. This Ultimate Spinner's Control Card can measure your WPI all the way from 6 to a whopping 80 wraps per inch! On the side of the tool is a protractor to help you measure your twist angle - plus a reminder of which way is S and which way is Z! Simply move your yarn along There are seven holes in varying sizes so you can use the tool as a diz, or thread a length of yarn or ribbon through the holes to hang from your wheel or keychain. At the bottom of the tool is a ruler you can use to check your twists per inch at the plying stage. Dimensions: 3 inches wide x 4.5 inches high Material: Maple wood