So first of all, yes, the Pivot X is a ruler. When folded up ... allowing it to serve as a 4-cm (1.6-in) measuring caliper. With its arm folded all the way out, the Pivot X has a total measuring ...

The folding action of the ruler also lets you draw perfect circles ... For really precise measuring jobs, there's a vernier caliper that slides out the end of one of the arms.