Click a radio button to play a note! The six notes are sampled from a Martin acoustic which was tuned with a quartz tuner to reference a=440.  If the image does not show the Tuner still works - order of notes from top to bottom as follows E A D G B E.

I love this great little tuner, but unless you have a laptop or palm computer it can only be of use when you are connected to the internet! Why not treat yourself or a friend to a neat set of pitch pipes or a snazzy guitar tuner:

Guitar Tuners at Piedog UK | Guitar Tuners at SheetMusicPlus USA