Using a McMorran Yarn Balance (or scale) allows you to identify the yards per pound (ypp) when it is unknown.

This tool is available from many sources specializing in weaving yarn . They are invaluable if you regularly use yarns of different weights or you are trying to find out the ypp of a skeined yarn. They are available for weighing yarn in both metric and imperial units.

Included are the steps for using this tool.