A compact needle gauge does exist!! The result is a joyous rainbow stack of connected discs for identifying knitting needle sizes US 0-15 / 2-10 mm. 

The discs swivel out and click back together with tiny magnets (which makes it as much fun to play with as use) and the whole rainbow tool is small enough to pop into the Accessory Roll so you'll never leave home without it.

And because Cocoknits is committed to avoiding plastic wherever possible, they manufactured it from PLA, a 100% biodegradable, plant-based plastic substitute!