A clip-on tuner is a small electronic device used by musicians to help tune their instruments, such as guitars or violins. It attaches directly to the instrument's headstock or body using a clip, allowing it to pick up vibrations and detect the pitch of the notes being played. This makes it easy to use in various environments, whether on stage or in a practice room. These tuners typically feature a digital display that shows the pitch of the note being played, indicating whether it is in tune, sharp, or flat. Many clip-on tuners are designed for specific instruments, but some can be used for multiple types, making them versatile tools for musicians.