Scenome provides a handy label changing system for each database. That said, it is important to note that numeric precision has nothing to do with what unit of measurement used. Internally, a tenth of a foot is the same as a tenth of a meter since the unit label is only used to assist in database legibility. US options are inches, feet, and miles. Metric options are centimeters, meters, and kilometers.
Changing the notations alters all internal and external value read-outs, but does not change the methods by which the database is stored. So if you import a metric meter database into a US foot database, you have to scale the content appropriately. However, depending on what data you choose to export or import into your runtime, all engine readouts for US or metric databases do change, allowing programmers to work with conveniently labeled values. This makes it much easier to implement algorithms in familiar terms or work with whatever system you are most comfortable.