Boss TU-02 Clip-on Tuner Clip-on Instrument Tuner with High-contrast Color Display

Features:Clip-on tuner with single battery operationUp to 24 hours of use on 1 batteryIncredibly precise tuning (+/- 1 cent)Swivel adjustment allows usage at many anglesBright color displayAuto shut-off feature preserves battery life4 tuning modes: chromat