Boss TU-3s Chromatic TunerTU 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
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