For calculating wraps per inch on handspun or commercial yarns.
This wooden gauge features a 1-inch and 1/2-inch slot. You wrap your yarn evenly in the slot (not too loose, not too tight) and count the number of wraps. The little instruction leaflet is attached, and gives a chart to determine the yarn type or you can use other charts that are available online or in spinning reference books. A handy leather loop is for hanging this on your wheel or on a hook.