The Boss TU-3 is the industry-standard chromatic tuner pedal for guitar and bass — a direct upgrade to the classic TU-2, widely regarded as one of the most reliable and durable stompbox tuners available. 

Key Features

•  21-segment LED meter with adjustable brightness and High-Brightness mode — Excellent visibility on dark stages or outdoors (cuts through glare). 

•  Accu-Pitch Sign function — Visual confirmation (flashing or indicator) when you’re perfectly in tune. 

•  Tuning Modes:

•  Chromatic (any pitch/instrument).

•  Guitar/Bass (tune by string number; supports 7-string guitars and 5/6-string basses).

•  Flat/Drop Tuning — Up to 6 semitones down in Guitar mode, 3 in Bass mode. 

•  Mute/Bypass — Silent tuning on stage; also acts as a buffered bypass (helps preserve tone in long pedal chains).

•  Note Name Indicator — Shows the note clearly (e.g., for extended-range instruments).

•  Accuracy: ±1 cent (very precise; improved over the TU-2’s ±3 cents). 

Specs Overview

•  Tuning Range: C0–C8 (16.3–4186 Hz).

•  Reference Pitch: A4 = 436–445 Hz (adjustable).

•  Power: 9V DC center-negative (85 mA); can power other pedals via daisy chain from the output.

•  Bypass: Buffered.

•  Build: Tank-tough BOSS compact pedal format — legendary durability for gigging. 

•  Dimensions/Weight: Standard Boss compact size (~2.4” x 5.1” x 2.1”, around 1 lb).

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