Alpaca Yarn Wrap Gauge & Knitting Needle Gauge

Two handy knitting tools to help knitters take accurate measurements:

Yarn Wrap Gauge - The usual method for measuring a yarn's wraps per inch, commonly abbreviated as WPI, is taking the yarn and wrapping it around a WPI gauge or a ruler. Count the number of times the yarn wraps around the gauge and that's the WPI, which is used to determine a yarn thickness*

And the Knitting Needle Gauge:  The tool you need to figure out what size your needles are - This little wooden gauge allows you accurately, gauge the sizes of some of the most common needles.