Boss TU-3 Chromatic Tuner

The world’s top-selling stage tuner, the BOSS TU-2, evolves and improves with the debut of the new TU-3. Housed in a tank-tough BOSS stompbox body, the TU-3 features a smooth 21-segment LED meter with a High-Brightness mode that cuts through the harshest outdoor glare. Choose between Chromatic or Guitar/Bass tuning modes, and enjoy visual pinpoint tuning verification with the Accu-Pitch Sign function. The TU-3 incorporates a convenient Note Name Indicator that can display notes of 7-string guitars and 6-string basses, while the Flat-Tuning mode can support up to six half-steps. It’s the new-standard tuner that no guitarist or bass player should be without!

• 21-segment LED meter with brightness control
• High-Brightness mode enhances meter visibility outdoors
• Accurate to +/- one cent
• Accu-Pitch Sign function provides visual verification when tuning is complete
• Chromatic and Guitar/Bass mode (tune by string number, with support for 7-string guitars and 6-string basses)
• Flat tuning is supported with Guitar Flat mode, which allows for “drop” tunings up to six semitones below standard pitch
• Tuner automatically mutes when the tuner is on
• Supplies power for up to seven BOSS compact effect pedals (with optional PCS-20A Cable)

• Tuning Range: C0 (16.35 Hz)--C8 (4,186 Hz)
• Reference Pitch: A4 = 436--445 Hz (1 Hz step)
• Tuning Accuracy: +/- 1 cent
• Display modes: Cent mode/ Stream mode
• Power Supply: Carbon-zinc battery (9V, 6F22) or Alkaline battery (9V, 6LR61)
• / AC adaptor (sold separately)
• Bypass: Buffered bypass
• 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 (Serves also as battery check indicator)
• Current Draw: 20 mA (DC 9 V)/ 80 mA (DC 9 V, when High Brightness mode is on)

Modes

• Chromatic
• Chromatic flat x2
• Guitar
• Guitar flat x2
• Bass
• Bass flat x3

Controls

• Pedal switch
• MODE button
• STREAM/CENT button

Connectors

• INPUT jack
• OUTPUT jack
• BYPASS jack
• DC IN jack
• DC OUT jack

Expected battery life under continuous use

• Carbon: Approx. 5 hours
• Alkaline: Approx. 21 hours
• These figures will vary depending on the actual conditions of use

Accessories

• Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTE," and "Information")
• Carbon-zinc battery (9V, 6F22)

Options (sold separately)

• AC adaptor: PSA series
• Parallel DC cord: PCS-20A(DC Plug x8)

Size & Weight

• Size Dimensions: 73 x 129 x 59mm (2-7/8 x 5-1/8 x 2-3/8inches)
• Weight(including battery):390g (14oz)

We are Chuck Levin's Washington Music Center

Since 1958, Chuck Levin’s Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.

Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.

Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.