How to Use a Niddy Noddy
A niddy noddy is a tool used to wind yarn into a skein while simultaneously measuring the length of the skein. Niddy noddies are available in many different sizes, though a common size of niddy noddy in the US makes a two yard skein. To calculate the yardage of a skein, multiply the number of yarn wraps in the skein by the length of one wrap.
Though niddy noddies are most often used by handspinners, they are indispensable gadgets for anyone who plays with yarn.