Patent 7968778 was granted and assigned to D'Addario on June, 2011 by the United States Patent and Trademark Office.
A combination of a capo with attached tuner having a sensor that picks up vibrations through the capo. The capo and tuner are connected together as a unitary accessory that is attachable along the neck of the guitar, in the manner of a conventional capo, but with the significant advantage of automatic and continuous visibility of the tuner display while tuning at a particular capo position and while pausing between songs.