I have a BOSS TU-12EX chromatic tuner.
The company offers one model for guitars,
and one for keyboards.
Nobody in the Milwaukee area had the BOSS
brand, so I ordered the keyboard model through
the music instrument retail store at which
I taught.
BOSS sent the guitar chromatic tuner, but I
ordered the keyboard tuner.
I didn't want to wait an extra 8 weeks, so I
use the guitar tuner. It works fine, but it's a
guess that the guitar tuning is not the best
for slide chromatic harps, keyboards and
pitched percussion.
Best Regards, Stay In Tune
JB