Boss TU-12

The Boss TU-12 is a chromatic tuner. You can see the Boss TU-12 in the picture which I included on the left. This is a photo of one of Brad's pedalboards when he was still with Third Day. You can have a better look at this pedalboard here. The Boss TU-12 is the pedal on the right, between the Electro-Harmonix POG and the Fulltone Wah pedal.

You can have a closer look at this tuner here. On this image you can clearly see all of the tuner's knobs and controls.