Clever Ruler is a powerful measuring tool for Windows. It's simple and easy to use. It can be transparent and rotatable. It supports multi-monitor. You can move,measure in your second monitor. The features are: transparent, can slant and rotate. It contains pixels, cm, inch, custom unit. You can also make the ruler not show any unit. It allows you adjust the width and length of ruler. It also includes magnifier, supports defining hot key, and supports scale.