Yes that sounds right too, though I don't think it would make much difference as the conductivity of brass (~109W/m.K??) is much higher than that of the TIM (~5W/m.K??) you normally use to mount sensors . It would be interesting to actually make one to find out. Depends on what order of accuracy you were after I guess. From what I've read around here the accuracy of the sensors would be the major stumbling block. I suppose at least it would give you a relative temp should you change a pump or block, so that you know whether your temps had improved or not.
