I didn’t hear this officially from pulsar, but have read previously the V1 sensors were somewhere between 55 and 60mK. The lower the number, the better the thermal contrast. This is often called NETD which is Noise Equivalent Temperature Difference. Before anyone asks, no I don’t know the values of other thermal manufacturers such as Flir, Bering optics, Triicon, ATN, etc.
It is something that is important, but there are other factors that are involved as well including the aperture of the lens. It is something Pulsar is really pushing to differentiate how their new core is better. Personally, I think they would’ve been better off saying something like the V2 core is X% more sensitive than the previous. When you start to spout out technical jargon, It might make sense to electrical engineer, but not to the standard Hunter.