A ruler isn’t something you need all the time ... I still prefer to use my tape measure for large objects. It also has a built-in folder to store measurements so you don’t have to write them down.

The tiniest “ruler” ever is so precise that it can measure the width of a single atom within a protein. Proteins and other large molecules, or macromolecules, sometimes fold into the wrong ...

Changing the ruler’s 0 origin means changing the position where the starting point (0) for measurement on the ruler ... that the zero origin of the ruler can be decided. Choose View > Snap ...

Now, we have a Ruler. You fire app Ruler and, well…your iPad is now a wooden ruler. You can switch between inches and centimeters, slide your finger on screen to measure stuff, and that’s it. It’s so ...