Just got my spinner today and was playing around with it. Was trying different settings and used one of my X2 clearos and pretty sure I fried it by going too high. Getting nothing out of it now. Not that it was a great loss as that one always had a funny taste anyway. So is there a guide or standard as to what voltage goes best with different resistant coils. Right now I have it at a little above 3.8v and it is working great on my X2 clearos, mini T3 and Liquimax clearos. Tried the lowest setting and can't see where it would be beneficial for much. I just don't want to go too high on anything and end up frying another.