Admit it, the iPhone in your pocket is like a Swiss Army Knife - it’s easy to carry and has a tool for almost every job; oh yeah, and it makes phone calls too. A ruler isn’t something you need all the ...

With the ruler placed carefully on the line, measure the centimetres first, then the millimetres. These are represented with the small lines. Here is a ruler and some straight lines for us to measure.

All measurements except the angle are calculated in the unit of measure currently set in the Units & Rulers preference dialog box. If your document has an existing measuring line, selecting the ...

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 ...