This ruler was confusing. I thought hexagons were measured by the length of one side, not the height from side to side??? This ruler measured by the height measurements. I can still use it, I just have to forget what is written on it and actually measure the side of the hexie I am using and then align it with the correct side on the ruler ignoring the measurements written on it. ??? I did watch a video on how to use it so that helped some.