Boss TU-3S Chromatic Tuner

Product ID: 109619

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  • Compact version of beloved TU-3 tuner
  • 21-segment LED meter with brightness control
  • Enhanced visibility thanks to High Brightness mode
  • Accu-Pitch Sign function provides visual tuning confirmation
  • Chromatic mode utilises full 21-segment meter for absolute accuracy
  • Guitar Flat mode supports "drop" tunings; to six semitones below standard pitch
  • Compatible with 6-string models, as well as 7-string guitars and even 6-string basses
  • Powered by optional PSA-series adapter and DC Out jack
  • Includes BOSS five-year warranty for total peace of mind
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Delivery & Returns

Delivery to UK mainland addresses* is FREE on orders over £75 and up to 30kg. (As a guide, a standard electric guitar weighs approx. 3-5kg).

Delivery on orders below £75 are charged at £4.45!

Delivery to Northern Ireland, the Scottish Highlands & Islands, Isle of Man, Isle of Wight and Channel Islands is weight dependant and will be indicated at the checkout

Delivery above 30kg to ANY location will vary according to weight and will be indicated at the checkout

LocationPriceStandard Delivery
UK mainland* FREE on orders over £75 £4.45 on orders under £75 1-3 working days
Northern Ireland, Scottish Highlands & Islands Isle of Man Isle of Wight Channel Islands £12.95 – any order value up to 30kg Over 30kg - please call 1-3 working days
Overseas Please call for details Please call

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The BOSS TU-3S Chromatic Tuner takes the trusted reliability of the go-to stompbox tuner of pros everywhere, and scales down the dimensions to a reduced footprint that makes it even more portable than before.

Rugged durability

As we've come to expect from the team at BOSS, the TU-3S is built like a tank - a must for those on the road. BOSS are so confident in the unit’s resilience; they've included a five-year warranty on every product. Unlike its predecessor, the TU-3S doesn't have a footswitch. Instead, it is always on and ready to go, which makes it ideal for integration into pedal switching systems, e.g. BOSS' ES-5 or ES-8. If the space on your pedalboard is at a premium, you needn't sacrifice including an essential piece of gear such as a tuner, the TU-3S does the job perfectly.

Choice tuning

The TU-3S doesn't just cater to the needs of guitarists. With Chromatic and Guitar/Bass modes available, there is support on-hand for 7-string guitar and 6-string basses. The Chromatic mode utilises the on-board 21-segment LED's to guarantee 100% accuracy when it comes to tuning to your desired note. The Flat-Tuning mode can support up to six half-steps (semitones) below standard pitch, accurately accommodating "drop" tunings.

Reassuring visibility

The BOSS TU-3S LED meter is equipped with a brightness adjustment control. Whether you're performing on a well-lit festival stage on a sunny afternoon, or in the darkest of basement venues, you can readily adjust the display for rapid visual confirmation. The Accu-Pitch Sign function provides visual verification when tuning is complete, giving you absolute confidence when you crack on with your set.

Powerful options

The BOSS TU-3S can be powered by an optional PSA series adapter, and even has a DC Out jack that enables you to power up to seven BOSS compact effect pedals using an optional PCS-20A daisy-chain cable.

ModelTU-3S Chromatic Tuner
Dimensions (H x W x D) 73 x 56 x 84 mm
Weight (including battery) 220 g
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
Nominal Input Level -20 dBu
Input Impedance1 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
DC IN jack
DC OUT jack
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)

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