I've been using Provaris long before rebuildables became popular. I had 2 of them even before the Lavatubes, and other such tube mods came out. But VV devices, such as the Provari, are, to me a valuable tool when working with rebuildables. In fact, I can't imagine working on them without one. They are multi purpose. Not only am I able to determine resistance; but I can vary the voltage, not only for finding the sweet spot when
vaping; but for checking and fine tuning my coils as well. If I were to fire a new coil at whatever voltage I'll probably eventually be
vaping it at, the coil would probably pop; especially if there's a hot leg between the top coil wrap and the center post. I'll start out at a very low voltage setting, and gradually bump the voltage up, as I'm fine tuning the coil. If I get a short along the way, the Provari will simply display an error, and I'm doing no damage to the device. Any protected variable voltage device, but especially the Provari, is money well spent, IMO.