RK Guitar Tuner is an easy-to-use, hands-free tool for tuning your guitar. It listens while you tune and provides a visual guide to help you through the process. To get started, inspect the volume indicator. While you talk or play something, you should see several green bars (4-7) appear and then disappear. If no green bars appear, too few bars appear, or the red bar appears often, please check out the section on 'Selecting the Microphone'.