I've been pleased with the Intellitouch - I have found that it sometimes displays the wrong note but the display bars which show if the note is sharp/flat seem to be correct. So I ignore the displayed note and rely on my ears to reassure me that I'm not THAT far out!

Will try the harmonics and octave tricks though.

Now all I need is a tuner for my voice. Maybe I could clip the Intellitouch to my dose - ow that hurts ...