TKL Exclusive Sock RulerSlip this ruler right into your sock while it is still on the needles to easily gauge when to start the toe. This handy ruler can be used in a few different ways. The length of a foot can be measured by standing on it. It works well to do this against a wall so the part of the heel that sticks out the most is in line with the edge of the sock ruler. Once you're knitting your socks you can use the inch cm ruler to measure the height of your cuff for