Used in like new condition. Peterson Tuners are the result of over 40 years of experience in making the finest quality tuning and ear training devices for the music industry. The engineers at Peterson, through extensive research, have made significant advances in strobe tuner technology. Peterson is the leading manufacturer of precision tuning equipment for the music industry worldwide. Responds at light speed to display relative tuning of any source to 0.1 cent accuracy. Automatic handsfree note selection. Automatic image clarity and contrast control for optimal viewing. +2/-1 display shifts strobe patterns into more visible middle ranges. Bass note patterns can be displayed 3 octaves higher and treble notes can be displayed one octave lower. Strobe patterns appear at correct note for Bb, F, and Eb instruments New external input and through output with mute enable onstage silent tuning.