This clip-on tuner pairs beautifully with lower-stringed instruments to offer fast, accurate chromatic tuning. It features 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 when used with cello and double bass. For optimum accuracy, attach the tuner to the lower-strings side of the bridge while in use. CR2032 battery included.