Full KORG OT-120M Specifications


The Korg OT-120M (above) is being replaced with the Korg OT-120M (below).
The new meter is identical to the old model as far as performance is concerned,
but it is small, stands up on a music desk safer, and comes with a soft carrying
case. The display background colors are greatly improved in contrast.

Engineered for precise pitch accuracy, versatile functionality, and with careful attention paid even to the movement of the needle, the OT-120M Orchestral Tuner allows ideal tuning under any conditions, with an incredibly broad tuning spectrum that covers the pitch ranges of all instruments.

The OT-120M is the newest model in Korg's lineup of tuners whose precision and functionality has made them the choice of musicians around the world. The OT-120M features a dual display with both a VU-style meter for accurate pitch indication and an LCD screen for excellent visibility.

Even with its advanced functionality, operation is simple, with intuitively understandable switches and dial. It provides a wide range of pitches and a variety of tuning methods, including a Sound Back mode that lets you check the pitch both by eye and ear. Housed in a compact package, the OT-120M orchestral tuner provides all the functionality you need for everything from transposing instruments to historical temperaments.

Featuring a dual display with a VU-style meter for accurate pitch indication plus an LCD screen

The dual display of the OT-120M provides a VU-style meter to guarantee high-precision tuning as well as an LCD screen that shows not just the correct pitch, but also the sound output level, calibration, key or temperament, and much more at a glance. Its broad range (A0-C8) provides instant coverage for all notes and ranges of wind, string, and keyboard instruments. The response of the needle to an input sound can be adjusted over three levels, from quick response for rapid tuning to slow response for careful tuning. Calibration can be adjusted over an exceptionally wide range to support any concert pitch.

Versatile tuning methods include Auto/Manual modes and Sound Back mode

You can choose from two tuning modes: Auto mode in which the pitch of a single note played on your instrument is detected automatically, or Manual mode in which the desired pitch can be specified in detail. A reference tone can be sounded, allowing two or more musicians to tune simultaneously. The sound output level can be adjusted in two levels, covering situations ranging from small studios to halls.

In addition, Sound Back mode detects the pitch that is input via the included contact mic to the input jack, and sounds the closest reference pitch from the built-in speaker. Since the meter also operates, you can verify the pitch by both eye and ear, which allows you to hone your sense of pitch and to tune more accurately. The built-in mic is ideal for pitch measurement of any acoustic instrument.

Broad support for transposing instruments and historical temperaments

As a convenience for transposing instruments, twelve keys including both sharps and flats are supported. The Multi Temperament function provides eight frequently-used historical temperaments, making the OT-120M the ideal choice for use with specific classical and other tunings.


Main Features:

Chromatic tuner with a wide 8 octave detection range that supports band
     and orchestra instruments. A0 (27.50 Hz) C8 (4186 Hz)
Chromatic tuner designed for classical instruments and piano
Dual display provides both a needle-type meter and an LCD for excellent visibility
Needle response speed is adjustable over three stages
Sound Back mode produces a reference tone closest to the pitch picked up
     by the included contact mic, and shows the difference between
     the input pitch and reference pitch
Multi-temperament function supports 9 historical temperaments
12 note transpose mode convenient for wind instruments
Two types of selectable tuning modes: Auto and Manual
Reference pitches can be output as sound C2 (65.41 Hz) C7 (2093 Hz)
Broad range of calibration (349 Hz - 499 Hz)
Detection accuracy 1 cent -- Sound accuracy 1.5 cent
Built-in mic-- The meter now comes with a built in mic.... PLUS....
The Clip On mic in the photo above comes with the meter,
     and it is vibration sensitive rather than acoustic. This will allow
     tuning in very noisy situations, such as band rooms and with rotten
     brats yelling :-) Most online stores do not sell the meter this way.
Other mics from other manufacturers may work well with the meter.
Designed for low power use and extended battery life
     (normally 100 hours or better with alkaline battery)
No AC adapter available at this time-- Discuss this when you call to order.
Power supply: two AAA batteries -- Two provided with purchase
Dimensions: 2.91 (W) x 4.71 (D) x 1.42 (H) -- Weight: 6.81 oz. (including batteries)
Durable soft case included-- This is the first Korg meter to come with a case.


Tuning with the OT-120M

When tuning with this meter, observe the following:

1. The instruction manual which comes with the meter may fail to tell you that the default tuning is Equal Temperament. Be sure to have nothing showing in the upper right corner of the digital display. This will then be Equal Temperament. The other eight tunings are not very useful for the novice, so leave them alone unless you know what they are for. Be sure to read the instructions and do not lose them so you can refer to them for the abbreviations of the classic tuning temperaments.

2. First, tune "F" to "F" over middle "C". Be sure to learn in the CD instructions, Appendix One, how to check your temperament in "F" to "F" in the middle of the keyboard by using Thirds and Sixths. This way you can tell if you got each note right.

3. After tuning "F" to "F" in the middle of the keyboard, duplicate this octave all the way to the bass end and then the treble end as in the CD instructions in Appendix One.

4. "Stretch" is not included in this meter, so you will need to do the stretch in this way. When you reach "C" of the low end of the second from the last octave in the treble, begin to raise each note slightly. At first, only 2 to 4 cents sharp will do. As you approach the middle of the second from top octave, raise the needle to show about 6 to 7 cents sharp. Taper the rest of the tuning, from the middle of the second from top octave to the last notes until the last notes are about 15 to 20 cents sharp on most pianos. You can go a little higher on spinets and consoles which go out of tune quickly.

Related Press Releases:



12 equal tempered, Pythagorean, Mean tone E flat / D sharp, Werckmeister III, Kirnberger III, Kellner, Vallotti, Young

Transposition Range:
C,C sharp,D,E flat,E,F,F sharp,G,G sharp,A,B flat,B

Detection Range:
Detection range:A0(27.50Hz)- C8(4186Hz)

Reference Tone:
C2(65.41Hz)- C7(2093Hz)five octaves, Two volume levels

Tuning Modes:
Manual, Auto (SLOW, MEDIUM, FAST), Sound, Sound Back

Calibration Range:
A4=349-499Hz (1Hz steps) Detection accuracy: +/- 1 cent

Sound Accuracy:
C2(65.4Hz) - B5(987.8Hz) +/- 1.00 cents or better
C6(1047Hz) - C7(2093Hz) +/- 1.5 cents or better

Pitch Guide Range:

AUTO (SLOW,MEDIUM,FAST), SOUND BACK Modes -50 cents - -3 cents flat -3 cents - +3 cents sharp/flat +3 cents - +50cents sharp

Manual Mode -500 cents - -3cents flat -3 cents - +3 cents sharp/flat +3 cents - +500 cents sharp

INPUT (1/4" mono), OUTPUT (1/4" mono), DC IN

Power Supply:
AA batteries x 2 (3V) [Included], or AC adapter
[We strongly discourage using the adapter.
The wire hanging in space is a perfect way to see
the meter slam on the floor as someone walks by]

Battery Life:
Approximately 100 hours (alkaline batteries, Meter mode, continuous input at A4)


2.91 (W) x 4.71 (D) x 1.42 (H) / 74 (W) x 120 (D) x 36 (H) mm

6.81 oz. (including batteries)