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.

Boss TU-3S Chromatic Tuner Pedal
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.

Features & Specs
- 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
- 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)
- Current Draw
-- 35 mA (DC 9 V)
-- 95 mA (DC 9 V, when High Brightness mode is on)
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
-- OUTPUT jack
-- DC IN jack
-- DC OUT jack
- Dimensions
-- 73 (W) x 84 (D) x 56 (H) mm
-- 2-7/8 (W) x 3-5/16 (D) x 2-1/4 (H) inches
- Weight: 220 g, 8 oz
- Accessories
-- 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)

Weight, Dimensions, and Manufacturer Part Numbers
Shipping Weight: 0.75 lbs
Shipping Dimensions: 6 x 4 x 3 in
Manufacturer Part Number (MPN): TU3S

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