Small Ruler for Swiss Army Knife

I almost never use the toothpick tool on my SAK - nor do I see the use of it. However, I always wish I could have a quick tool to quickly gauge length of an item, therefore I designed this tiny ruler. 

The ruler could measure up to 4cm, has a minor grid of 0.1mm. It is not the most accurate tool but can quickly help you to gauge the approximate length of small objects.