当您需要知道长度，又没有在直尺在身边的时候，EZ Ruler（直尺）可以帮到您。它是EZ Carpenter工具箱的一个，支持厘米和英寸的测量，让您的iPhonee具备直尺的功能。
Whenever you need to measure the length without a ruler, EZ Ruler can help you. You can measure the object length in centimeter or inches. As one of the tools in EZ Carpenter, now you always bring a ruler with you as in your iPhone.
EZ Tool-box 
EZ Constellation (星座占卜) 
EZ Journey of Vinci(宋游记)