CenterPitch CP10XL Intonation Trainer and Tuner Center Pitch CP10XL Intonation Tool with Metronome The Center Pitch CP10XL 3-In-1 Tuner is a mic & plug based, non clip-on style tuner and intonation training tool This chromatic tuner has a metronome, tuner, and pitch generator - ideal for all Band and Orchestra players The backlit display has the traditional, copyrighted Center Pitch Arrows, and has a 1/4 inch jack for direct plug in When the instrument is in Tune, the red backlight changes to a bright Green color!