A metronome is probably the most important practicing tool every guitarist should have.
It's a tool often used to improve the inner rhythm, but not only! It's used to improve speed and accuracy, and it's the number one learning tool recommended by all guitar teachers and professionals.
In my opinion, a metronome is essential to have for any guitarist who's serious in wanting to learn his instrument and really improve his rhythm and techniques.
Note: If the boxes appear empty, just do a browser refresh!