Korg Chromatic Tuner. The GA40 has an enlarged display, increased sensitivity and rounded edges. It is a great step up from the Korg GA30. In Guitar mode it supports seven-string guitars (7B through 1E), and in Bass mode it supports six-string basses (Low-B and Hi-C).

• A compact tuner designed specifically for guitar and bass, with excellent performance and convenient functionality.
• Large, high-precision meter-type display for stable tuning indication.
• Quinta-Flat Tuning mode allows dropped tunings from one to five semitones.
• Supports tuning of seven-string guitars and six-string basses.
• Sound Out function lets you produce a reference tone from the internal speaker.
• Bypass function.
• Auto Power Off function saves the battery even if you forget to turn off the tuner.
• Memory Backup function.
• Approximately 85 hours of continuous use.