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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)
Flat tuning in Guitar Flat mode, up to six semitones below standard pitch
Auto mute when the tuner is on
Supplies power for up to seven BOSS compact effect pedals
BOSS five-year warranty

BOSS TU-3 Chromatic Floor Tuner

  • Tuning Range
    C0 (16.35Hz)–C8 (4186Hz)

    Reference Pitch
    A4=436–445 Hz (1Hz step)

    Tuning Accuracy±1 cent

    Power Supply
    DC 9 V: Dry battery 6F22 (9 V) type (carbon),
    Dry battery 6LR61 (9 V) type (alkaline),
    AC Adaptor (PSA series: optional)

    Current Draw
    30 mA (DC 9 V), 85 mA (DC 9 V, when High Brightness mode is on)

    Owner’s Manual,
    Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and “Information”),
    Dry battery/9 V type (6F22)

    AC adaptor: PSA series, Parallel DC cord: PCS-20A

    Width 73 mm, 2-7/8 inches
    Depth 129 mm, 5-1/8 inches
    Height 59 mm, 2-3/8 inches
    Weight 390 g, 0 lbs. 14 oz.
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