World-Standard Performance in a Tiny Footprint
The BOSS TU-3 is the worlds 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-3the 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 RangeC0 (16.35 Hz)C8 (4,186 Hz)Reference PitchA4 = 436445 Hz (1 Hz step)Tuning Accuracy+/- 1 centModesChromatic
Chromatic flat x2
Guitar
Guitar flat x2
Bass
Bass flat x3Display modeCent mode
Stream modePower SupplyAC adaptor (sold separately)BypassBuffered bypassControlsMODE button
STREAM/CENT buttonNominal Input Level-20 dBuInput Impedance1 M ohmNominal Output Level-20 dBuOutput Impedance1 k ohmRecommended Load Impedance10 k ohms or greaterIndicatorCHECK indicator (Power on indicator)ConnectorsINPUT jack: 1/4-inch phone type
OUTPUT jack: 1/4-inch phone type
DC IN jack
DC OUT jackCurrent Draw30 mA (DC 9 V)
85 mA (DC 9 V, when High Brightness mode is on)AccessoriesLeaflet (USING THE UNIT SAFELY, IMPORTANT NOTE, and Information)
Parallel DC cord (DC Plug x2)
Rubber footOptions (sold separately)AC adaptor: PSA series
Parallel DC cord: PCS-20A(DC Plug x8)Size and WeightWidth73 mm
2-7/8 inchesDepth84 mm
3-5/16 inchesHeight56 mm
2-1/4 inchesWeight (including battery)220 g
8 oz* 0 dBu = 0.775 Vrms*The specifications are subject to change without notice.