Chromatic tuner format effect pedals (boss), it's solid!
Supply 9V battery or transformer.
LEDs.

With a garland the pedals can alimentrer other pedals.

Guitar tuning, chromatic, bass ... luminous s'avrent trs practices in concert.
Do not dnature the sound of the intrument.

Two outputs can hear or not the instrument.

More decision-head to match!
Tuning ultra fast and efficient even between songs.