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


**PSA240 9v Power Adapter**

Boss TU-3S Chromatic Tuner

$149.00 Regular Price
$141.55Sale Price
  • Tuning Accuracy: +/- 1 cent


    - 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


    - MODE button
    - STREAM/CENT button


    - INPUT jack
    - OUTPUT jack
    - DC IN jack
    - DC OUT jack


    - 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)

Castle Hill Store
Opening Hours

Monday to Friday: 9.30am - 6pm 

(School holidays: 5.30pm)  

Saturday: 9.30am - 4pm

Sunday: Closed

Rouse Hill Store

Opening Hours​

Monday-Friday: 9.00am - 5.30pm

Thursday: 9.00am - 9.00pm

Saturday: 9.00am - 5.00pm

Sunday: 10.00am - 5.00pm