The TU12 (both models) definitely won't handle the low B of a bass (referred to as "B0" [b zero] in official music-speak). As far as inexpensive hand held tuners that do, I used to use a Korg "Bass" model tuner (model BT-1 maybe). I think it's out of production, but it was a typical needle movement tuner. Now I've got a Boss TU 70, which is an LCD display type, and I like it a lot. I always wanted that type of display, but all the other manufacturers don't include a backlight, but the Boss does. This model may also be out of production, as I don't see it in the mail order catalogues anymore. There is new version with a metronome called the TU 80. There used to be a Boss tuner called the TU 6 (I think) that was basically a guitar/bass only version of the TU12 (six notes, not chromatic). I don't think it's still around, but it did B0. Boss and Korg also make more expensive ones that handle it (more expensive than the TU12). The TU 2 handles B0, and most of the tuners in multi-fx pedals do too.