Hands up who has a yarn stash.  Here's a nifty wee tool to help you work out the gauge of your odd balls of yarn. 

Wrap the yarn round the center section, do it with purpose but don't pull it tight.  The number of wraps you fit into the gap tells you the gauge.  The grooves are a cheat - lie the yarn along the groove to see which one it fits best.   

Overall dimensions: 5cm x 6cm.
Designed and made in Scotland from FSC approved cherry wood veneer.