CHROMATIC TUNER Korg GA Custom Chromatic Tuner. It belongs to KORG's 'Custom Shop' laserie, the highest quality brand. 3D visual meter that creates a revolutionary visual effect. Ultra-high tuning precision: +/- 0.1 hundredth. Three measurement modes. Built-in high sensitivity microphone, allowing use with orchestral and acoustic instruments. - Scale: 12 notes equal temperament. Detection range: A0 (27.50 Hz) - C8 (4186 Hz). Calibration Range: 436 - 445 Hz (1 Hz steps). Detection accuracy: +/- 0.1 hundredths. Input impedance: 1 Mohm (tuner on). Connectors: INPUT (mono 1/4 'jack), BYPASS (mono 1/4' jaco). Power: Two AAA R03 Batteries. Battery life: about 40 hours (continuous A4 input, tuner on, Display mode: Regular, using 2 AAA zinc-carbon batteries). Dimensions (W x D x H): 99 x 65 x 16 mm (including legs). Weight: 83g. (including batteries). Items included: two AAA batteries to verify operation