Boss TU-3S Chromatic Tuner Pedal

If pedalboard space is at a premium, look to the TU-3S for your tuning needs. This unique design nixes the pedal switch for simple, compact operation.

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.

The industry-standard tuner in an ultra-compact size for pedalboards.


- 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
- BOSS five-year warranty
WARNING: Cancer and Reproductive Harm -

Tuning Range: C0 (16.35 Hz)--C8 (4,186 Hz)
Reference Pitch: A4 = 436--445 Hz (1 Hz step)
Tuning Accuracy: +/- 1 cent

- Chromatic
- Chromatic flat x2
- Guitar
- Guitar flat x2
- Bass
- Bass flat x3

Display mode:
- Cent mode
- Stream mode

Power Supply: AC adapter (sold separately)

Current Draw:
- 35 mA (DC 9 V)
- 95 mA (DC 9 V, when High Brightness mode is on)

Bypass: Buffered bypass

- 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)

- INPUT jack
- OUTPUT jack
- DC IN jack
- DC OUT jack

Dimensions (W x D x H): 2-7/8" x 3-5/16" x 2-1/4" (73 x 84 x 56 mm)

Weight: 8 oz (220 g)

- Owner's Manual
- Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTE," and "Information")
- Parallel DC code (DC Plug x2)
- Rubber foot

- Options (sold separately): AC adaptor: PSA series, Parallel DC cord: PCS-20A (DC Plug x8)
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 0.75 lbs
Shipping Dimensions: 6 x 4 x 3 in
Manufacturer Part Number (MPN): TU3S

For support or warranty questions, please contact the manufacturer:
Phone: 323-890-3700


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