BOSS TU-3, (Used)

The BOSS TU-3 is a compact chromatic tuner pedal designed for guitar (or bass) that provides precise tuning via a bright LED meter visible on stage or in daylight. The unit detects pitch and displays flat/open/sharp indications in real time, allowing fast and accurate tuning during breaks between songs or mid‑set.

It operates via standard ¼‑inch input and output jacks, and can be powered either by a 9 V battery or a compatible DC adaptor. When activated, the pedal mutes the signal output to avoid unwanted noise or feedback while tuning; when disengaged, it passes the signal transparently.

Construction is in a rugged metal chassis built for the wear and tear of live use. The TU‑3 is widely used in both live and studio environments due to its reliability, clarity of tuning feedback, and simplicity — making it a dependable tool for ensuring instruments stay in tune under varied conditions.