The Korg GA-2 Guitar/Bass Tuner delivers quick and precise tuning, in a stylish, compact, hand-held unit. A clear display screen features a needle-style meter with large high-visibility note name and string name for pitch accuracy, along with LED indicators. Like other hand-held tuners from Korg, the GA-2 Guitar/Bass Tuner is equipped with an adjustable calibration of 430-450Hz, along with a sound mode that emits a reference tone from the built-in speaker for easy usability. The GA-2 is also equipped with a Quinta Flat tuning mode which supports lowered tunings, ideal for bass guitars. If that's not enough, players can benefit from up to 200 hours of continuous usage with two AAA alkaline batteries.

The GA-2 is equipped with both Guitar mode or Bass mode for truly easy operation with automatic pitch detection. The guitar mode supports 7-string guitars (7B through 1E), while the bass mode supports 6-string basses (Low-B, Hi-C). A high-sensitivity microphone is built-in, for easy and accurate tuning of acoustic guitars, allowing you to tune by ear using the Sound Out Mode.

For quick and precise intonation, the GA-2 features a needle-style meter that displays the pitch quickly and accurately, along with the note name and string. The GA-2 also features red and green LEDs which indicate the pitch discrepancy for a smoother tuning, and ideal for performances with poor lighting.

The GA-2 features a compact body profile, that can fit inside any instrument case. This credit-card sized unit is perfectly rounded, accommodating any hand shape and offering comfortable usability. A new mechanism allows the battery compartment to be easily removed for quick and easy replacement. The battery cover simply slides over the entire body, eliminating the risk of misplacement.

Unlike other tuners from Korg, the GA-2 features a Quinta Flat Tuning mode which supports lowered tunings used in heavy metal styles, giving more weight to the sound. The GA-2 offers five steps of flatted tuning with up to five semitones below standard pitch, and supports super-long scale guitars that are five frets longer than standard guitars. In addition, the GA-2 also features an adjustable calibration value of 430–450 Hz for added versatility.

As well as offering quick and precise tuning, the GA-2 tuner also features a high-efficiency long-life design, offering up to 100 hours of continuous operation when used with two AAA zinc-carbon batteries, or approximately 200 hours on alkaline batteries.