Korg MG1 Magnetic Guitar Solo Tuner

The Korg Magnetune is a guitar tuner that magnetically attaches to the tuning pegs, strap button, or any other metal part of your guitar. Leave it on your guitar to easily tune while performing, attach it to your music stand, or just throw it in your pocket. A movable ring allows the magnet to be rotated 360 degrees, letting you attach the unit to right- or left-handed guitars and conveniently tune at any angle.

LEDs indicate the string number, tuning direction, and amount of discrepancy

The diameter is just 1.3 inches (33 mm), just slightly larger than a soda bottle cap and about the size of a wristwatch

Lightweight at just 11 grams

Battery life of approximately 30 hours