ChiaoGoo Swatch & Needle Gauge

The 5" Swatch Gauge which not only measures Hook / Needle sizes but it is also a swatch gauge to ensure you get the perfect tension for your project:

• 14cm (5.5") ruler markers along 2 edges of square (cm on one side, inches on the other)
• Knitting needle conversion chart (metric vs US vs UK)
• Crochet hook conversion chart (metric vs US vs UK)
• Yarn gauge info with recommended needle sizes)
• Knitting Needle and Crochet Hook needle sizer holes from 1.5mm to 10mm!
  

And the 3" Swatch Gauge is the smaller version of 5" swatch gauge - perfect for slipping into smaller project bags/notions cases:

• 7cm (3") ruler markers along 2 edges of square (cm on one side, inches on the other)
• Knitting Needle and Crochet Hook needle sizer holds from 2.75mm - 6.5mm