Korg's new tuner, the OT120, is designed for orchestras, featuring high performance and an easy-to-use design. Its dual display, easy-to-see needle type indicator, and illuminated display showing battery and sound output levels, calibration, and note name are standout elements of its design.
Since the first tuner was produced in 1975, Korg's tuners have been the choice of musicians for their reliability. With its wide range from A0 to C8, the OT120 can easily tune any type of brass band or orchestra instrument (wind, string or keyboard). It can also support pitch calibration at A4=349-449 Hz (in 1 Hz steps).
The OT120 can produce a five-octave range from C2 (65.41 Hz) to C7 (2093 Hz). Two or more musicians can use this sound as a reference when tuning. You can change the output level in two stages. The large speaker provides loud sound and easy hearing. In Sound Back mode, you can connect the optional CM-100 microphone to the input jack so that the device produces a tone as close as possible to the tone you produce with your instrument.

Technical Specifications:
Transpose Range: C, C#, D, Eb, E, F, F#, G, G#, A, Bb, B
Detection Range: A0 (27.50 Hz) ~ C8 (4186 Hz)
Reference Tone: C2 (65.41 Hz) ~ C7 (2093 Hz), five octaves, two-step volume control
Tuning Modes: AUTO (SLOW, MEDIUM, FAST), MANUAL, SOUND BACK
Calibration: A4 = 349 – 499 Hz (in 1 Hz steps)
Measurement Error Rate: +- 1%
Audio Error Rate: +- 1.5%
Connections: INPUT (1/4” phone jack), OUTPUT (1/4” phone jack), DC IN (9 V)
Power Source: two AAA batteries or AC adapter (sold separately)
Battery Life: Approximately 100 hours (with alkaline batteries in meter mode without display light)
Dimensions: 74 x 120 x 36mm.
Weight: 193g (including battery)
Accessories: Two AAA batteries to make sure the device works, 1 case.
OT120 options:
AC adapter
CM-100 microphone