I assume that harp experience applies to electronic tuners for the lute. The Korg is well respected in the harp community, but I'll add another one to the list. I use the Zen-on Chromatina 331 (about $80 US). It calibrates to A 438 through 445 in increments of one. It has a needle that swings from -50 cents to +50 cents with markings at intervals of 10 cents (and enough swing to eyeball to about 2 to 3 cents). A pair of red lights show below or above pitch (and both light when with in a cent or so of exact). Absolute pitch is shown as lights on a diatonic scale, with a "sharp" light added if appropriate. Inputs are built in mike and direct pick up (and there is an output for those with an electrical instrument, which I don't have, so the tuner can be "in-line" with the speakers). I find it works well on the harps when the pick up is clipped to the sound box, and works well on the lute with the pick up on any peg.
One negative, it seems to have some memory of a sound. The string must be fully damped before striking it again or the machine gets a bit confused. And a caveat for all electronic tuners, even when using a pick up you may get false readings (although so false as to be obvious) if you have background sound. The mike is supposed to shut down when the input plug for the pick up is inserted. But when I first got this for the harps I was tuning with the TV on (it takes quite a while to tune 52 strings) and got false readings. I blocked the mike with foam and tape, then finally realized that it wasn't a false reading, the TV sound was resonating the harp soundbox (a lot bigger than a lute) - the mike wasn't interfering, it was the resonation from the ambient noise. So if a tuner seems "jumpy" it may not be the tuner but the noise, even if using the direct pick up. Best, Jon
