BOSS TU-3S Chromatic Guitar Bass Tuner (B-STOCK)

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BOSS TU-3S Chromatic Guitar Bass Tuner (B-STOCK) BOSS TU-3S Chromatic Guitar Bass Tuner (B-STOCK) BOSS TU-3S Chromatic Guitar Bass Tuner (B-STOCK) BOSS TU-3S Chromatic Guitar Bass Tuner (B-STOCK)
BOSS TU-3S Chromatic Guitar Bass Tuner (B-STOCK)

World-Standard Performance in a Tiny Footprint

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


  • Tuning Range
    • C0 (16.35 Hz)--C8 (4,186 Hz)
  • Reference Pitch
    • A4 = 436--445 Hz (1 Hz step)
  • Tuning Accuracy
    • +/- 1 cent
  • Modes
    • Chromatic
    • Chromatic flat x2
    • Guitar
    • Guitar flat x2
    • Bass
    • Bass flat x3
  • Display mode
    • Cent mode
    • Stream mode
  • Power Supply
    • AC adaptor (sold separately)
  • Current Draw
    • 35 mA (DC 9 V)
    • 95 mA (DC 9 V, when High Brightness mode is on)
  • Bypass
    • Buffered bypass
  • Controls
    • MODE button
    • STREAM/CENT button
  • 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)
  • 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)

Size and Weight

  • Width
    • 73 mm
    • 2-7/8 inches
  • Depth
    • 84 mm
    • 3-5/16 inches
  • Height
    • 56 mm
    • 2-1/4 inches
  • Weight (including battery)
    • 220 g
    • 8 oz
More Information
Condition B-Stock
UPC 4156189572
Weight 2.000000
Promotion Free 2-Day
Shipping Free 2-Day
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