The New World-Standard Tuner Has Arrived The evolved and improved version of the world’s top-selling Boss  TU-2 stage tuner, this is 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

Specifications 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 Carbon-zinc battery (9V, 6F22) or Alkaline battery (9V, 6LR61)
AC adaptor (sold separately) Bypass Buffered bypass Controls Pedal switch
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 (Serves also as battery check indicator) Connectors INPUT jack
OUTPUT jack
BYPASS jack
DC IN jack
DC OUT jack Current Draw 30 mA (DC 9 V)
85 mA (DC 9 V, when High Brightness mode is on) Expected battery life under continuous use Carbon: Approx. 12.0 hours
Alkaline: Approx. 23.5 hours
*These figures will vary depending on the actual conditions of use. Accessories Owner's Manual
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 and Weight Width 73 mm
2-7/8 inches Depth 129 mm
5-1/8 inches Height 59 mm
2-3/8 inches Weight (including battery) 390 g
14 oz * 0 dBu = 0.775 Vrms *The specifications are subject to change without notice.