An 11-point LED meter shows how far a note is from pitch. In Stream mode, the LEDs move more slowly as the note gets closer to correct tuning.

A 7-segment display shows the note or string name. Reference pitch is adjustable from 438 to 445 Hz in 1 Hz steps, and the range spans C0 to C8.

Tuning can be silent through the mute setting, or the signal can pass while tuning. A separate Bypass jack sends an unmuted feed to a second destination. The TU-3 is the later model in the series.