CYN, I am going to have to do a little checking on this devise of yours. Cbiblis had built the very same thing as you described and for some reason or other, he took it out of his bators. I am thinking it had to do with temperature control, the silicon egg would read temps as you described, but it took longer between the heatup and cool down cycles to register a change in the temps. In other words, it works, it was just slow showing any actual change in the temps. Anyways, he changed to something other than silicon as the filler for the plastic egg and it seemed to work just fine. I'll try to find out what material he ended up using or if he just scrapped the whole ideal.