How do I use my amp's chromatic tuner?

I am trying to tune to drop B using a fender mustang v2 built-in tuner.I understand that drop b is B-F#-B-E-G#-C#. The problem is that when I go to tu

I am trying to tune to drop B using a fender mustang v2 built-in tuner.
I understand that drop b is B-F#-B-E-G#-C#.
The problem is that when I go to tune my 5th string to F# (the amp says it's F#) for example, it's super low. It's like it's reading everything as the sixth string!

or:I am trying to tune to drop B using a fender mustang v2 built-in tuner.I understand that drop b is B-F#-B-E-G#-C#. The problem is that when I go to tune my 5th string to F# (the amp says it's F#) for example, it's super low. It's like it's reading everything as the sixth string!

Tags:amp,confused,