It seems ridiculous that nobody had really used a pedal tuner until the 1998 release of the BOSS TU-2 Chromatic Tuner, but it took until that time for the concept of a tuner-in-a-pedal to go viral. And go viral it did!!! Still today you’ll see a BOSS pedal tuner gracing the pedalboards of the majority of the star players of the guitar world.
The TU-3 Chromatic tuner is an updated version of the venerable old TU-2. It’s 21-segment LED display provides greater resolution, while it’s high brightness display can be more easily seen on outdoor stages. The TU-3 Chromatic Tuner sports a variety of tuning modes including flattened tunings and drop tunings that support extended range guitars and basses.
FEATURES
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, with support for 7-string guitars and 6-string basses)
Flat tuning is supported with Guitar Flat mode, which allows for “drop” tunings up to six semitones below standard pitch
Tuner automatically mutes when the tuner is on
Supplies power for up to seven BOSS compact effect pedals


