Korg TM40 Digital Tuner and Metronome
- C1 (32.70 Hz) to C8 (4186.01 Hz) detection range
- Tuner and metronome, together or independently
- Large LCD needle plus LED pitch and tempo lights
- Built-in mic and speaker, Sound Out reference pitch
- DC input jack, CM-100 contact mic sold separately
- 3 year parts and labor warranty
- 3.84 ounces
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A clear, visual tuner and metronome for practice rooms and lessons, covering wind, string and keyboard players. Power details beyond a DC jack are not listed, so check what runs it before buying.
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ASIN: B000AAGM0MModel: KOR TM40Category: Metronomes
Overview
On a music stand in a practice room, the Korg TM40 runs a tuner and a metronome at once or one at a time. A large LCD needle and LED lights show pitch deviation and blink the tempo, while a built-in mic hears acoustic instruments.
Visibility is the case for it: a large needle display paired with LED lights makes pitch and tempo readable from a distance. The built-in mic handles acoustic tuning, and the separately sold contact mic is the route to more precise readings.
Who it's for
Practice sessions where tuner and metronome run together, such as a teacher working with wind or string students. Players who tune on stage through a pedalboard will want a different kind of tuner.
Pros and cons
- Tuner and metronome run at once
- Large needle display reads from distance
- LED lights show tempo and pitch
- Built-in mic for acoustic instruments
- Contact mic sold separately
- Battery type not listed
- Not a clip-on or pedal tuner
Performance notes
Accuracy depends on how cleanly the signal reaches the tuner: the built-in mic suits acoustic instruments in a quiet room, while a contact mic sends vibrations directly for more precise readings. Korg states that even low instruments with complex overtones are detected precisely, and the needle plus LED display makes small deviations easy to see.
Specifications
| Brand | Korg |
|---|---|
| Model | KOR TM40 |
| Dimensions & fit | |
| Item weight | 0.24 pounds |
| Capacity & performance | |
| Tuner detection range | C1 (32.70 Hz) To C8 (4186.01 Hz) |
| Calibration Range | A4 = 410Hz 480Hz |
| Detection Range* | C1 (32.70Hz) - C8 (4186.01Hz) for a sine wave |
| Compatibility & installation | |
| Compatible accessory | CM-100 contact mic (sold separately) |
| Warranty & support | |
| Warranty Description | 3 years |
| Other details | |
| Connector Type | DC Input Jack |
| Item Type Name | Digital tuner and metronome |
| Microphone | Built-in high-sensitivity mic |
| Reference Tone | C4 (261.63Hz) C5 (523.25Hz) One octave or A Bb |
| Scale | 12 note equal temperament |
| Tuning Modes | Meter mode (AUTO), Sound Out mode (MANUAL) |
Frequently asked questions
Is the Korg TM40 a clip-on tuner?
No. It is a standalone tuner and metronome with a built-in mic and speaker. For direct pickup it works with the separately sold CM-100 contact mic.
Can the Korg TM40 tune a bass or other low instruments?
Korg says even low-pitched instruments with complex overtone structures are detected with precision within its stated range.
What is Sound Out on the Korg TM40?
Sound Out uses the built-in speaker to play a tuning reference pitch, so you can tune by ear as well as by the meter.
Does the Korg TM40 come with a power adapter?
The listing shows a DC input jack but does not list an adapter or batteries as included, so confirm the power source before relying on it.