Guitar Tunner ADT-300T Guitar Tunner *General mini-tunner*A4=440Hz*Tunning Range: A0(27.5Hz)--A6(1760Hz)*Semitone flat: b, bb, bbb, bbbb*Tuning Key: C, F, Bb, Eb*Tuning Mode: MIC, CLIP*Tuning: Chromatic*Tolerance:±0.5 cent APEXTONE has many other tunners for your instruments, pls kindly contact us for more details!