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BOSS TU-3 Chromatic Tuner Best Guitar Tuner with 21-segment LED Meter with High-Brightness Mode


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The world's top-selling stage tuner, the BOSS TU-2, evolves and improves with the debut of the new TU-3. Housed in a tank-tough BOSS stompbox body, the TU-3 features a smooth 21-segment LED meter with a High-Brightness mode that cuts through the harshest outdoor glare. Choose between Chromatic or Guitar/Bass tuning modes, and enjoy visual pinpoint tuning verification with the Accu-Pitch Sign function. The TU-3 incorporates a convenient Note Name Indicator that can display notes of 7-string guitars and 6-string basses, while the Flat-Tuning mode can support up to six half-steps. It's the new-standard tuner that no guitarist or bass player should be without!

- 21-segment LED meter with brightness control
- High-Brightness mode enhances meter visibility outdoors
- Accurate to +/- one cent
- Accu-Pitch Sign function provides visual verification when tuning is complete
- Chromatic and Guitar/Bass mode (tune by string number, with support for 7-string guitars and 6-string basses)
- Flat tuning is supported with Guitar Flat mode, which allows for "drop" tunings up to six semitones below standard pitch
- Tuner automatically mutes when the tuner is on
- Supplies power for up to seven BOSS compact effect pedals




1. Does the BOSS TU-3 affect the signal when put in a chain?

  • No. The BOSS TU-3 does not affect anything.

2. Does the BOSS TU-3 work when plugged only on the input?

  • Yes.

3. Can the BOSS TU-3 tune a half step down?

  • Yes.

4. Does the BOSS TU-3 work as a buffer in the chain?

  • Yes.

5. Can I use the BOSS TU-3 to tune a 10-string guitar?

  • Yes.

6. Can the BOSS TU-3 tune a ukulele?

  • Yes.

7. Can I use the BOSS TU-3 to do a drop d tune on a 6-string guitar?

  • Yes.

8. Can the BOSS TU-3 do a standard tune on a bass?

  • Yes.

9. Does the BOSS TU-3 do Celtic tuning?

  • Yes, the BOSS TU-3 is a chromatic tuner.

10. Is the high brightness mode on the BOSS TU-3 good?

  • Yes, the high brightness mode on the BOSS TU-3 is brighter than most tuners out there.

11. Does the BOSS TU-3 work on a mandolin?

  • Yes.

12. Does the BOSS TU-3 work with an autoharp?

  • Yes.

13. Does the BOSS TU-3 have an on-and-off switch?

  • Yes.

14. Does the BOSS TU-3 work with a power supply?

  • Yes, you need a 9v power supply but the BOSS TU-3 should work with a 9v battery.

15. Can the BOSS TU-3 do a drop tune to A?

  • Yes.

16. Can the BOSS TU-3 mute an instrument?

  • Yes.

17. Does the BOSS TU-3 suck volume from the chain?

  • No.

18. Can the BOSS TU-3 control the volume?

  • No, the BOSS TU-3 is a tuner.

19. Can the BOSS TU-3 tune an 8-string guitar?

  • Yes.


  • Tuning Range: C0 (16.35 Hz)--C8 (4,186 Hz)
  • Reference Pitch: A4 = 436--445 Hz (1 Hz step)
  • Tuning Accuracy: +/- 1 cent
  • Modes: Chromatic, Chromatic flat x2, Guitar, Guitar flat x2, Bass, Bass flat x3
  • Display mode: Cent mode, Stream mode
  • Power Supply: Carbon-zinc battery (9V, 6F22) or Alkaline battery (9V, 6LR61), AC adaptor (sold separately)
  • Bypass: Buffered bypass
  • Controls: Pedal switch, MODE button, STREAM/CENT button
  • Nominal Input Level: -20 dBu
  • Input Impedance: 1 M ohm
  • Nominal Output Level: -20 dBu
  • Output Impedance: 1 k ohm
  • Recommended Load Impedance: 10 k ohms or greater
  • Indicator: CHECK indicator (Serves also as battery check indicator)
  • Connectors: INPUT jack, OUTPUT jack, BYPASS jack, DC IN jack, DC OUT jack
  • Current Draw: 20 mA (DC 9 V), 80 mA (DC 9 V, when High Brightness mode is on)
  • Expected battery life under continuous use: Carbon: Approx. 5 hours, Alkaline: Approx. 21 hours *These figures will vary depending on the actual conditions of use.
  • Accessories: Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTE," and "Information"), Carbon-zinc battery (9V, 6F22)
  • Options (sold separately): AC adaptor: PSA series, Parallel DC cord: PCS-20A(DC Plug x8)

Size & Weight

  • Width: 73 mm, 2-7/8 inches
  • Depth: 129 mm, 5-1/8 inches
  • Height: 59 mm, 2-3/8 inches
  • Weight (including battery): 390 g, 14 oz

* 0 dBu = 0.775 Vrms
*The specifications are subject to change without notice.

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