Korg OT-120 Orchestral Tuner Chromatic tuner with a wide 8 octave detection range that supports band and orchestra instruments. Dual display provides both a needle-type meter and an LCD for excellent visibility. Sound Back mode plays a reference pitch for the note that's closest to the input pitch. The meter indicates the discrepancy between the input and the correct pitch. (This feature requires the additional purchase of the CM-100L microphone.) Multiple Temperaments support historical tunings Transpose mode is convenient for wind instruments. The factory package dimensions for the KOR OT120 is 3.75 (W) x 5.75 (D) x 2.5 (H)