YUP either get an OHM METER to test your heads/coils or get a mod that can test OHMS. Like the Lambo or LavaTubeV.2 or Provari? I think the provari can test ohm. As can the Zmax and Vmax. So, to get into rebuildables you should have an ohm meter or ohm reading PV right off the bat or you could possibly put your PV in danger, or even harm yourself. AS FOR DRY BURNING NEW heads/coil+wick set ups: You can try new VIVI heads or new coil wraps by dropping a few drips of juice onto your wick/coils. For this you could use unflavored PG/VG if your not sure whether or not you like the juice. You could even use your rebuildable atomizer or VIVINOVA as a dripping atty in this way, so long as you make sure your dripping enough juice into the wick with each session. Once your wick/coil set-up is broken in (and by broken in, I mean has a soot build-up, or a gooey glycol/glycerine build up, then you can do SHORT dry burns. Word? So get yourself some vivi nova tanks and some cheap china made finicky rebuildable genesis attys and do work son.