The Eclipse chromatic clip-on tuner offers fast, accurate chromatic tuning on and off the stage, featuring a full color vertical display, auto power-off, and pitch calibration in a discreet, compact design. The multi-swivel action allows for the perfect viewing angle and can be mounted in front of or behind the headstock on right- and left-handed instruments. Tuner calibration from 430 - 450Hz. CR2032 battery included