Chances are you already need a steel ruler for your fixing and making tasks, so why not use one that can do much more than ...

There are two main constructions which can be done using a ruler, a pair of compasses and a pencil. Place the compasses on the left-hand endpoint of the line and position the pencil to just over ...

A leaky gel pen here, a pencil shaved down to the rubber there ... it can also fit a scientific calculator, an 18cm ruler and a whole bunch of Tombow Brush Pens (which are approximately 19cm ...

The pencil could bump up against an on-screen ruler, or help you to not color over ... that comes from the physical sensation of a quality pen seamlessly moving across paper." ...