Chromatic Orchestral Tuner-Sound back mode produces a reference tone closest to the pitch played into the microphone. Transpose mode (up to 12 keys)-convenient for wind instruments. Three meter modes (slow/medium/fast). Multi-temperament function supports eight frequently used historical temperaments. Selectable tuning mode-auto or manual. Dual display-VU-style meter and LCD screen for ideal visibility. Angled display allows easier visibility from a distance. Tuning range A0-C8. Built-in mic or can be used with the optional TN40CM contact mic.