D'Addario NS Micro Violin Tuner Features a non-marring, lever-lock clamp that holds the tuner securely to the instrument while allowing easy application and removal. Built-in piezo transducer picks up instrument's vibration rather than sound Tri-color reversible backlit LCD screen makes it easy to tune in dark environments Wide calibration range (410Hz to 480Hz) and visual metronome Tunes both violins and violas