The Mahalo set of pitch pipes are the perfect way to keep your ukulele in tune. It only has the four notes - GCEA - which a standard ukulele is tuned to, so no chance of confusion. The tuner itself never goes out of tune, does not require a battery and is sounded simply by blowing it. You are inadvertently training your ear too as you try to match the tone coming from the tuner to that of the appropriate string on your ukulele. All that and it is brilliant value too!