Before revision: Pocket-sized Korg chromatic LCD tuner, with simulated analog indicator needle In music, an electronic tuner is a device that detects and displays the pitch of musical notes played on a musical instrument.
After revision: 200px|Guitar tuner showing that the "E" string is too sharp and needs to be tuned downPocket-sized Korg chromatic LCD tuner, with simulated analog indicator needle In music, an electronic tuner is a device that detects and displays the pitch of musical notes played on a musical instrument.