All, I've had several over the years. The difficulty with many is they are spoofed by harmonics. Right now, I'm happiest with a little Korg CA-30. It's about the size of half a deck of cards, tells you what pitch is sounding, has a "meter" calibrated down to 5 cents, green light for on pitch (probably a 2 to 3 cent tolerance) and red lights for flat or sharp of pitch, calibrates from A=410 to A=480, sounds an A or a Bb, and accepts a microphone-- or presumably 1/4" phone plug transducer. Other than compact size, the beauty of it, for me, is it doesn't seem to be spoofed by other harmonics generated by a string. My two cents worth. Cheers, Steve
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