Did anyone else notice that all the wands in Harry Potter were measured lengths in inches? Being in the UK, shouldn't a metric unit, such as centimeters, have been used? It could be that the units are simply converted for the US copies of the books, but Pottermore also lists them in inches. Do wizards not use the metric system? I just thought that was weird.
Because it's a movie about armed crazy people, why would they use metric?