Gauge: Quickly determine WPI rating by counting yarn wraps per inch or laying the yarn along the black strip until you find a match. Use the chart provided to compare your WPI number to the weight category to determine the weight of your yarn Needle Gauge: The knitting needle adopts US 0-15 and metric 2-10mm. If the needle size marking is worn, the hole can help you quickly confirm the needle size Twist angle gauge: Align the yarn with the vertical line, then slide it over the gauge to find the degree line that best matches the twist angle, helping you measure the twist angle and reminding you which direction is S and which direction is Z Convenience: The camber notches can hold the yarn on the spinning wheel and prevent the yarn from unraveling when you are resting in the spinning. The square notch can be paired with a gift chain and lobster clasp for easy carrying or hanging wherever you want Multifunctional: It is made of high-quality acrylic material, clearly marked and multi-functional, which can quickly determine needle size, WPI, yarn weight, and measure twist angle. Is a perfect multifunctional tool in everyday life