[pHaestus]

I generally test around 19-20C; the pump imparts a substantial amount of heat into the water, and when the fans on my radiator aren't running this can warm the water up a fair amount. I just swapped the probes (put the inlet probe into the outlet probe's fitting and vice versa) and now the top reading is a little higher. I'll let it return to equilibrium and then check it in an hour or two. I'll replace the probes as they were for all of the earlier wb testing and see if I can't generate an offset vs flow rate curve for you guys tonight too.

This is actually a VERY good thing; I can deal with a little offset in my thermistors a hell of a lot easier than I can more fundamental problems with the experiment (like large secondary heat inputs from mobo traces).