Korg GA-1 Guitar/Bass Tuner - also suitable for 7-string guitar
(7B-1E) and 6-string bass (low B, high C), tuning via jack input
or integrated microphone, B0-B6 range (23.12-1975.74Hz) +/-1 cent
accuracy, reference tone. Tuning modes: LCD (auto, guitar, bass),
sound (manual, guitar, bass). Tunings: guitar (including 7-string
detection), bass (including 5/6-string detection), flat tuning
function, fold out stand.