Korg OT120 Orchestral Tuner

Tune guitars, wind instruments and more with the OT120's 8-octave range and multiple temperament settings. The needle meter and LCD display ensure accuracy.

Tune string and wind instruments in a flash with the OT-120, a tuner that combines the accuracy of needle-type meters with superior functionality, wide tuning range and a, sleek vertical design.

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 (Patented: Patent pending) 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

Multiple Temperaments support historical tunings

Transpose mode is convenient for wind instruments

Choose from 3 levels of needle response speed (slow, medium and fast)

Both auto and manual tuning modes are provided

Built-in reference tone plays in a 5-octave range

Broad range of calibration (349 Hz--499 Hz)

Built-in mic supports acoustic instruments

Use with the optional CM-100 contact mic for accurate tuning in noisy environments

Energy-saving design for long battery life (approximately 100 hours)

Durable soft case included

Vertical-Design and Superior Visibility
The OT-120 chromatic tuner is intended for orchestral instruments, packing precise performance and sophisticated functionality in a vertical design that's easy to hold and operate. It features a dual-display, an easy-to-see needle-type indicator and a backlit LCD screen that shows the battery life, sound output level, calibration, key read more and note name. Additional design features include a large dial that makes it easy to select the desired mode, soft-touch buttons and a rear-mounted stand that lets the unit stand by itself. A sophisticated silver aluminum panel contributes to its sleek look.

Accurately Tune Orchestral Instruments Over a Wide Range
Since Korg developed the world's first meter-type tuner in 1975, the accuracy of Korg tuners has made them the choice of artists in all styles of music. With its wide tuning range extending from A0 to C8, the OT-120 lets you quickly tune any type of band instrument including, orchestra, wind, string, brass or piano. The OT-120 also provides a wide range of calibration to support concert pitches in a range of A440=349-499 Hz (1 Hz steps).

Smooth and Precise Tuning You Expect from a Needle-Type Meter
The OT-120 uses a high-precision needle-type meter to accurately indicate any pitch discrepancy. The speed at which the needle responds to the input can be changed over a range of 3 steps; you can choose fast, medium or slow to match your tuning preference.

You can also choose from 2 tuning modes; Auto mode, which automatically detects the pitch of a single note you play on your instrument, or Manual mode, which lets you specify the desired note name. In Manual mode the needle movement is shown in a range of +/- 50 cents, letting you view the tuning discrepancy over a wide range. In addition to the excellent visibility unique to a needle-type meter, the LEDs located below the meter also indicate pitch deviation or a perfect match, making precise tuning easy even in dim locations.

Sound Back Mode Provides a Reference Tone That's Ideal for Tuning String or Wind Instruments
The OT-120 produces a reference tone in a 5-octave range extending from C2 (65.41 Hz) to C7 (2093 Hz). You can switch the output level in 2 stages. The large speaker allows for more volume while not being obstructed even when using the stand, ensuring that the reference tone is clearly audible.

The OT-120 also provides Korg's proprietary Sound Back mode. This mode lets you connect an optional CM-100 contact mic to the input jack, and automatically make the OT-120's speaker produce a reference tone for the note that is closest to the input pitch you play on your instrument. The meter will also indicate the input pitch, letting you tune using your eyes as well as your ears for greater accuracy -- and also providing a great way to train your sense of pitch.

Support for Transposing Instruments and Historical Temperaments
For conveniently tuning any wind instrument, 12 types of transposing keys are provided including both sharps and flats. The Multi Temperament function provides 8 presets that cover the most popular historical temperaments often used with period instruments. These are also ideal for checking unique temperaments used in classical music.

Long Battery Life
The OT-120 is designed for an extended battery life of approximately 100 hours when running on two AAA batteries. It can also be used with an AC adaptor (sold separately).

Soft Case Included
A durable, suede-tone soft case is included.
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Scale: 12 equal tempered, Pythagorean, Werckmeister III, Vallotti, Mean Tone Eb, Kirnberger III, Young, Mean Tone D#, Kellner

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), 5-octave, 2-step volume control


Calibration: A4 = 349 - 499 Hz (1 Hz steps)

Detection Accuracy: +/- 1 cent

Sound Accuracy: +/- 1.5 cent

Connections: INPUT (1/4 in. jack), OUTPUT (1/4 in. jack), DC IN (9 V)

Power Supply: 2 AAA batteries, or AC adapter (sold separately)

Battery Life: approx. 100 hours (with alkaline batteries, in meter mode (MEDIUM), continuous A4 tone, without backlit)

Dimensions: 2.91 in. (W) x 4.71 in. (D) x 1.42 in. (H) / 74 (W) x 120 (D) x 36 (H) mm

Weight: 6.81 oz. (including batteries) / 193 g (including batteries)

Accessories: 2 alkaline AAA batteries for checking operation, a suede-tone soft case

Options: AC adapter, CM-100 Contact Microphone

*Even if a sound is within the detectable pitch range, detection may be difficult for instruments that have a large number of overtones or that decay rapidly.

Specifications subject to change without notice
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 0.75 lbs
Shipping Dimensions: 6 x 4 x 3 in
Manufacturer Part Number (MPN): OT120
Shipping Weight: 0.75 lbs
Shipping Dimensions: 6 x 4 x 3 in
Manufacturer Part Number (MPN): OT120

For support or warranty questions, please contact the manufacturer:
Phone: 631-390-6800
Web: https://www.korgusa.com/support

Reviewers gave this product an overall rating of 5 out of 5 stars. (2 ratings)
Submitted April 18, 2023 by Russell

"The fastest and most accurate tuner out there"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
Written by one of our gear experts!
Other than a strobe tuner, you can't get much better than this. It tracks very quickly and very accurately- it can even tune double stops; it will track the more out of tune note. Great for setting up guitars or for any orchestral musician or vocalist. There really isn't anything as good as a good analog needle tuner. Pretty durable too; I've dropped it a number of times and it works as well as ever but this a delicate instrument so do handle with care. Gripes- only tracks to C7 so if you play violin or piccolo it's not gonna work for that. It has these cool temperament modes but you can't change the key center of them; they appear to all be based around concert c so they're essentially worthless unless you are tuning a harpsichord or something. Soundback only works with the contact mic or some other direct input besides the built in mic. Batteries last a good while in it too, though the ones it comes with are pretty crappy.

Musical Background:

30 years

Musical Style:

violin, clarinet, saxophone
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