I can't find it for the life of me....but there is something being sold out there that you can attach to your PV to show the voltage being put out. If you look at the video on Ken's website from the NY vapor meetup, it's shows it being used.
BTW - got notice my LS was shipped today. Please be here Saturday....please Mr. Postman?
yup, I saw that on the video as well.. pretty cool, but I don't think I would want to drag something like that around either... I think an easy fix would be to just mark the dial and the box itself with a sharpie or something... would rather not though, but a quick fix I guess