Have you ever spun some fiber and wonder if your thickness will produce enough yardage for your planned project? Or purchased a cone of yarn and don’t know how much yarn you really have? It’s easy to find out, by using a handy tool called a yarn balance. The balance is a scale that allows you to determine the yardage of a particular yarn. It consists of a rectangular plastic box and a balancing arm. The arm has been calibrated to calculate the yards per lb. of a particular yarn.