The Sock Ruler Junior
The Sock Ruler
The Sock Ruler? « ?Çïis constructed of a heavy duty, yet flexible plastic; an innovative measuring tool for sock knitters that goes inside of the sock, allowing it to lie flat and ensure accurate measurements (both metric and imperial).
Two sizes in one package: a small one for baby/infant feet and a larger one for children sizes small and medium. (The regular size ruler accommodates a child size large.)