USA droolers, keep in mind that these tools are mostly to completely metric. That does not at all need to be a reason to shy away. Squares and indicators do the same things in both systems. How often do you use an indicator for actual measuring? Beyond that, memorizing a few conversion numbers keeps you moving along. When lost, Google, Machinery's Handbook, charts and slide rule type conversion tools make it pretty simple. You still get your number and machine to it when using either standard. Soon you become ambidextrous with using both systems, and that is a real advantage in the shop.