Pick up Boss's TU-3 Without the Footswitch - The Boss TU-3S Chromatic Tuner Half Pedal

The BOSS TU-3 is the world’s go-to stompbox tuner, trusted by players everywhere for its reliable operation and bulletproof durability. Scaled down in size, the TU-3S gives you the same industry-standard performance in a tiny footprint that saves precious pedalboard space. The display and tuning functions are identical to the TU-3—the only thing eliminated is the pedal switch. Always on and ready to go, the TU-3S is perfect for use with pedal switching systems like the BOSS ES-8 and ES-5, and ideal for any setup where space is at a premium

• Respected TU-3 tuning performance in a more compact size
• 21-segment LED meter with brightness control
• High Brightness mode enhances meter visibility outdoors
• Accu-Pitch Sign function provides visual verification when tuning is complete
• Chromatic and Guitar/Bass modes, with support for 7-string guitars and 6-string basses
• Guitar Flat mode supports “drop” tunings up to six semitones below standard pitch
• Powered by optional PSA-series adapter; DC Out jack for powering up to seven BOSS compact effect pedals via an optional PCS-20A daisy-chain cable
• BOSS five-year warranty

SPECIFICATIONS

• Tuning Range: C0 (16.35 Hz)--C8 (4,186 Hz)
• Reference Pitch: A4 = 436--445 Hz (1 Hz step)
• Tuning Accuracy: +/- 1 cent
• 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 (Power on indicator)
• Bypass: Buffered bypass

Modes

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

Display modes

• Cent mode
• Stream mode

Current Draw

• 35 mA (DC 9 V)
• 95 mA (DC 9 V, when High Brightness mode is on)

Controls

• MODE button
• STREAM/CENT button

Connectors

• INPUT jack
• OUTPUT 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)

Manufacturer: Boss
Model: TU-3S
SKU: I439409-N-2-WHXA
UPC: 761294508978

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.