I live in the US and everything is mostly in base 12 English and it drives me nuts because I build and run 3D printers and they are all designed and parts are sold custom made . I often use this to check measurements that match what I have in Fusion 360 for projects. And when I need a more accurate measurement, I pull out a caliper. But for quick metric measurements this is a great and affordable tape measure for those stuck in countries that mostly only sell English tape measures.