There seems to be some questions and mis-information floating around on the conductivity of stainless steel and suitability for use in mod's.
First, yes, stainless steel is not as conductive as many metals, but the part many have left out of the equation in their haste to quote (yet not understand) metal resistiance charts, is it's conductivity is dependent upon length the current has to travel. It is NOT A FIXED resistor as the resitance goes up with the length the electricity has to travel through said material. Shorter distances equals less total resistance!
In our PV's, the distance the electricity has to travel (very short) and the gauge of material it is flowing through (large), makes stainless steel an excellent candidate for use in PV's. Futher more, it is more corrosion and scratch resistant (less polishing) has much greater tensile and hardness ratings compared to aluminum (superior thread strippage resistance) and, since one can run a much thinner wall thickness when using stainless without sacrificing strength, it can often times weigh the same or less then some comparable aluminum mods.
Other ways i address this conductive issue in the new Precise line so it is not an issue:
First, the positive current in the Precise line of mods does NOT flow through the stainless steel. The center post on the Precise is made of Brass, not stainless steel, and directly connects the battery to the atomizer, thus no significant electrical loss.
Second, the negative current is conducted through the body, but the body size, gauge and electrical path distance is sufficient/short enough to carry the low voltage and amperage that PV's produce.
Third, on the battery to switch contact, both the new Precise 16340 and Precise 18650 have a custom machined 4 prong brass contact post.
Demonstration video of Aluminum/Brass Vs. Stainless Steel Conductivity and why either is equally suitable in PV applications though i believe the nod goes to stainless for it's superior scratch and corrosion resistance as well as a much greater resistance to thread strippage:
YouTube - Stainless Vs Aluminum Loaded Test