I have used the FBV Express and the FBV Shortboard to tune to all kinds of different tunings, from standard E to Drop A, and they both recognize and diplay the "correct" notes. I have noticed that sometimes it will display a flat note above what you are looking for. For instance, an F# will be displayed as a Gb on the display, but it still works fine and keeps me in tune! The answer to your question is yes!
