MediaTester can test any media (SD, microSD, thumb drives, memory sticks, etc. It is a freeware utility application.
Here are some screenshots to illustrate the features and user interface of this application:
Check to see if USB thumbdrive is the advertised size. Screenshot of MediaTester - 1167px · 1070pxMediaTester: User interface. Screenshot of MediaTester - 1167px · 1070px