Tuners are devices used to help musicians maintain proper tuning of their instruments. They are typically small devices that a musician can attach to their instrument to help maintain the proper tuning of the notes. Common types of tuners include strobotuners, chromatic tuners, and digital tuners. Strobotuners use a spinning disc to measure the exact frequency of the note. Chromatic tuners measure the absolute frequency against a fixed reference frequency. Digital tuners are the most sophisticated and allow musicians to store tuning data on a computer or device.