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BOSS TU-3S Chromatic Tuner Best Guitar Tuner Inspired by TU-3 Tuning Performance in Compact Size


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The BOSS TU-3 is the world's go-to stompbox tuner, trusted by players everywhere for its reliable operation and bulletproof durability. Scaled down in size, the TU-3S gives you the same industry-standard performance in a tiny footprint that saves precious pedalboard space. The display and tuning functions are identical to the TU-3-the only thing eliminated is the pedal switch. Always on and ready to go, the TU-3S is perfect for use with pedal switching systems like the BOSS ES-8 and ES-5, and ideal for any setup where space is at a premium

- Respected TU-3 tuning performance in a more compact size
- 21-segment LED meter with brightness control
- High Brightness mode enhances meter visibility outdoors
- Accu-Pitch Sign function provides visual verification when tuning is complete
- Chromatic and Guitar/Bass modes, with support for 7-string guitars and 6-string basses
- Guitar Flat mode supports "drop" tunings up to six semitones below standard pitch
- Powered by optional PSA-series adapter; DC Out jack for powering up to seven BOSS compact effect pedals via an optional PCS-20A daisy-chain cable




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

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

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

  • Yes.

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

  • Yes.

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

  • Yes.

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

  • Yes.

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

  • Yes.

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

  • Yes.

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

  • Yes.

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

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

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

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

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

  • Yes.

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

  • Yes.

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

  • Yes.

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

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

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

  • Yes.

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

  • Yes.

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

  • No.

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

  • No, the BOSS TU-3S is a tuner.

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

  • Yes.

20. What is the difference between the BOSS TU-3S and the BOSS TU-3?

  • The two pedals are very similar but the BOSS TU-3S has a pedal switch, unlike the TU-3.


  • 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: AC adaptor (sold separately)
  • Bypass: Buffered bypass
  • Controls: 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 (Power on indicator)
  • Connectors: INPUT jack: 1/4-inch phone type, OUTPUT jack: 1/4-inch phone type, DC IN jack, DC OUT jack
  • Current Draw: 30 mA (DC 9 V), 85 mA (DC 9 V, when High Brightness mode is on)
  • Accessories: Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTE," and "Information"), Parallel DC cord (DC Plug x2), Rubber foot
  • 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: 84 mm, 3-5/16 inches
  • Height: 56 mm, 2-1/4 inches
  • Weight (including battery): 220 g, 8 oz

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

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