Boss TU-3

BOSS TU-3 Chromatic Tuner – Rugged, Accurate Stage Tuning

The BOSS TU-3 builds on the legacy of the world’s best-selling stage tuner, the TU-2, with improved accuracy, durability, and visibility. Designed in the classic BOSS stompbox format, it delivers precise tuning performance trusted by professionals worldwide.

With a 21-segment LED meter and selectable High-Brightness mode, the TU-3 ensures clear visibility even under bright stage lights or outdoor conditions. The Accu-Pitch Sign function provides a visual confirmation once tuning is complete, while multiple tuning modes support chromatic tuning, guitar, bass, and drop tunings.

Built tough and road-ready, the TU-3 also doubles as a power supply for up to seven BOSS compact pedals, making it an essential tool for live and studio setups.

Key Features

• Legendary BOSS stompbox tuner design, road-tough and reliable
• 21-segment LED tuning meter with High-Brightness mode for outdoor use
• Accu-Pitch Sign function for visual tuning verification
• Chromatic mode plus Guitar/Bass modes (supports 7-string guitar and 6-string bass)
• Flat Tuning mode supports drop tunings up to six semitones below standard pitch
• Mutes signal output automatically when tuner is activated
• Can power up to seven BOSS compact pedals with optional power supply

Specifications

• Model: TU-3
• Brand: BOSS
• Effect Type: Chromatic Tuner
• Signal Format: Analog
• Input: 1 x 1/4-inch audio jack
• Output: 1 x 1/4-inch audio jack (bypass)
• Power Supply: 9V battery or PSA-series AC adapter (sold separately)
• Power Consumption: 30 mA (DC 9V)
• Dimensions: 15.2 × 9.7 × 6.7 cm
• Weight: 390 g
• Colour: White
• Body Material: Metal