Sock Ruler

This tool can be used for knitting socks from top to toe. It has two scales, one for the foot and one for the shaft. For the shaft you can use it as a simple ruler. Just hold it to your work. For the foot you have to insert the round side into the knitted sock up to the heel. If you press your knitting work down to the ruler you are able to read the different sizes and where to start with the toe cap.
Up to know there is only a sock ruler for European sizes and with German annotations.