Guys be careful in getting the vivi nova from thera liquids, my friend who i refered to get from there got one set and all the atomizer heads has incorrect ohms, i checked using my provari the 1.8 was 2.3 , the 2.5 was 3ohms and the 3 ohms was 3.6 ohm, since he is a new vaper using an ego vv batt, the lowest ohm is barely firing. He tried to ask for a replacement but he was told that since its not dead it cannot be replaced, for me its a misinfo since he did not get the product that was indicated on the site. Just try your luck with vape LAH, i bet they have better customer support.