Boss TU-3S Chromatic Tuner

BOSS TU-3S Chromatic Tuner

BOSS TU-3S Chromatic Tuner provides 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 BOSS TU-3S Chromatic Tuner 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

BOSS TU-3S Chromatic Tuner Spec

Tuning Range: C0 (16.35 Hz)–C8 (4,186 Hz)

Reference Pitch: A4 = 436–445 Hz (1 Hz step)

Tuning Accuracy: +/- 1 cent

Chromatic flat x2
Guitar flat x2
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

MODE 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
DC IN jack
DC OUT jack

Owner’s Manual
Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTE,” and “Information”)
Parallel DC code (DC Plug x2)
Rubber foot

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

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