Boss TU-3 Chromatic Tuner Pedal

Boss TU-3 Chromatic Tuner Pedal | No Limit Guitar Co, Idaho Falls

The Boss TU-3 is practically a modern legend — the latest member of BOSS's world-famous TU Series, building on the TU-2's status as the world's best-selling tuner pedal and adding high-brightness mode for outdoor and festival gigs, expanded tuning modes, and the same rock-solid, stomp-after-stomp reliability that has made BOSS tuner pedals the industry standard. A large, clear 21-segment LED meter with Accu-Pitch verification, chromatic and Guitar/Bass string-number modes, flat tuning support down to six semitones below standard, and the ability to supply power for up to seven BOSS compact pedals make the TU-3 far more than just a tuner — it's an essential pedalboard utility that earns its spot on every board it occupies.

Product Overview

The TU-3's 21-segment LED meter is the most visible and immediate aspect of the tuning experience — bright, clear, and readable in most conditions, with a dedicated high-brightness mode that enhances visibility in direct outdoor sunlight where standard LED displays can wash out and become difficult to read. Whether tuning up between songs at an outdoor summer festival or in a dimly lit club, the TU-3's display delivers the large, glare-free, clear pitch readout that performing musicians need to tune accurately and quickly under any lighting condition.

Three tuning modes cover the full range of practical tuning needs. Chromatic mode displays note names for flexible, instrument-agnostic tuning — ideal for players who tune by note rather than string number, or for tuning unconventional stringed instruments and alternate tunings. Guitar/Bass mode displays string numbers instead of note names, streamlining the tuning process for players who think in terms of string position, with support for 7-string guitars and 6-string basses so extended-range players are fully covered. Guitar Flat mode supports flat and drop tunings down to six semitones below standard pitch — essential for players who regularly use drop tunings and need a tuner that handles those detuned references accurately without requiring manual note-name calculation.

The Accu-Pitch function provides visual verification when a string reaches perfect pitch — rather than requiring the player to read the LED meter position manually, Accu-Pitch signals when tuning is complete with a clear visual indicator, reducing the cognitive load of tuning under performance pressure. The tuner automatically mutes the output signal when engaged — standard and essential for stage use — and the bypass output maintains a continuous unaffected signal for use in tuner-out or signal-splitting configurations.

One of the TU-3's most practically valuable non-tuning features is its ability to supply power to up to seven BOSS compact effects pedals from its DC output — reducing or eliminating the need for separate power supply units on a BOSS-based pedalboard and keeping the overall setup neater and simpler. Reference pitch is adjustable from A4 = 436Hz to 445Hz for playing with ensembles or instruments tuned to non-standard reference frequencies, and the ±1 cent accuracy ensures precise tuning results across the TU-3's full tuning range of C0 to C8.

Ideal For

• Guitarists and bassists who need a dependable, road-proven tuner pedal with crystal-clear display in any lighting condition including outdoor daylight
• Players with 7-string guitars or 6-string basses who need a tuner that properly supports extended-range instruments
• Drop and flat tuning enthusiasts who need accurate tuning reference down to six semitones below standard
• Pedalboard builders who want to consolidate power delivery for up to seven BOSS compact pedals through a single tuner pedal
• Any performing guitarist or bassist who wants the reliability of the world's best-selling tuner pedal lineage in their signal chain

Key Features

21-Segment LED Meter with High-Brightness Mode
A large, clear 21-segment LED display is readable in most lighting conditions, with a high-brightness mode that enhances visibility in direct outdoor sunlight — making the TU-3 equally reliable at indoor gigs and outdoor festivals.

Accu-Pitch Visual Verification
The Accu-Pitch function provides a clear visual indicator when a string reaches perfect pitch — reducing the manual effort of reading the LED meter under performance pressure and confirming accurate tuning with a single, unambiguous signal.

Three Tuning Modes — Chromatic, Guitar/Bass, and Guitar Flat
Chromatic mode tunes by note name, Guitar/Bass mode tunes by string number with support for 7-string guitars and 6-string basses, and Guitar Flat mode supports drop and flat tunings down to six semitones below standard pitch.

Powers Up to Seven BOSS Compact Pedals
The TU-3's DC output supplies power to up to seven BOSS compact effects pedals — reducing the need for separate power supply units and keeping a BOSS-based pedalboard neat, tidy, and cable-efficient.

Auto-Mute When Engaged
The TU-3 automatically mutes the output signal when the tuner is activated — standard and essential for silent tuning during live performance without signal passing through to the amplifier.

Adjustable Reference Pitch
Reference pitch is adjustable from A4 = 436Hz to 445Hz — accommodating ensemble playing situations where the reference standard differs from standard A440.

±1 Cent Accuracy Across Full Tuning Range
±1 cent accuracy across the full C0–C8 tuning range ensures precise tuning results regardless of instrument, string, or register.

What's Included

• Boss TU-3 Chromatic Tuner Pedal
• 9V Battery (included)
• Free standard shipping

Note: 9V DC power supply sold separately.

Technical Specifications

Get Your Hands on This Tuner Pedal Today

The Boss TU-3 is available now at No Limit Guitar Co in Idaho Falls. Stop in to pick one up or reach out online to order yours — the tuner pedal the world's greatest performers trust, now on your board.