WPI - Angle of Twist Tool

The wraps per inch (WPI) gives hand spinners an idea of the finished-weight category of their handspun yarn. A WPI tool can tell you whether you've spun a fine lace yarn or a super bulky yarn, which helps us describe yarn to other spinners or in a note to ourselves for future reference.

Handy 1" and 2.5cm rulers as well as a handy twist-angle tool. As a spinner, you strive for a yarn suited to your intended project. The information learned from a twist-angle tool helps you to achieve more consistent yarns. This means that you can duplicate yarns or resume where you left off when you walk away from your wheel for a while and achieve the same level of twist.