Exactly what I'm looking for- another example I hadn't considered-
Its kind of another discussion we're having elsewhere (deliberately avoiding mentioning the device by name), but the point is that the sweet spot is a little different on each atty, so the concept of dialing in a power level and expecting all of your attys to heat the juice the same way, without ever having to adjust the power, is a fallacy.
The ProVari is an excellent tool for proving that- just use two different attys from different manufacturers that have the same resistance- I bet you'll tweak the voltage up or down a notch to get it to taste the same as the other.....