The TU-3S gives you the same tuning accuracy as Boss's legendary TU-3 in a tiny footprint that saves real estate on a crowded pedalboard. The 21-segment LED meter with High Brightness mode is easy to read even under harsh stage lights, and the Accu-Pitch function gives you a visual confirmation when you're locked in.

It supports chromatic and guitar/bass modes, handles 7-string guitars and 6-string basses, and flat tuning mode covers drop tunings up to six semitones below standard. Since there's no footswitch, the TU-3S is ideal for switching systems like the Boss ES-8 or ES-5, or any setup where you use a separate bypass controller. Bonus: the DC Out jack can power up to seven Boss compact pedals via an optional daisy-chain cable. Requires an optional PSA-series adapter.