I noticed that several multi-tools include a ruler. That could come in handy and would be fairly easy to incorporate into my multi-tool. I would use the side of the lipstick tube, it measures 1.5 inches or 3.9cm. On one side of the tube I marked 1 inch with 1/18 inch increments. On the other side, I marked out the centimeters with 1 mm increments.
To do this, just place a ruler on the side of the tube and marked the increments with pen onto the tube. I then etched these marks into the tube with a sharp edge. To make the marks stand out more I coloured in the marks with a black felt pen.