California Series Clip-On Tuners Candy Apple Red. Fender’s California Series Chromatic Clip-On Tuner conveniently powers up automatically as soon as it’s attached to the headstock of a guitar or bass. The compact tuner’s vibration-sensing capabilities let players tune easily and accurately in any performance situation, and its bright LCD screen is ideal for the darkest stages. An easy-to-read needle displays green when in tune but changes color to indicate sharp of flat notes