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Korg GripTune Tuner

Scale 12-note equal temperament (A4=440Hz) Range (sine wave) A0 (27.50 Hz) – C8 (4,186 Hz) Precision +/-1 cent Battery Life Approximately 17 hours (tuner continuously operating, A4 input) Dimensions (W x D x H) 43 x 29 x 24 mm / 1.69" x 1.14" x 0.94" Weight 13 g / 0.46 oz. (including battery) Included Items CR2032 lithium battery (3V) x 1 (for verifying operation) - See more at: http://www.korg.com/us/products/tuners/griptune/specifications.php#sthash.VLfHmISE.dpuf