007 said it all very well. In fact, I have he same yellow top right now. And my hatch rates don't seem to go past 2/3 even. Its a real headache. It works, but the temps must be off on mine. I have lots of chicks in the egg die at around day 20. I'm happy to hear you at least had almost 100% successful rate with all eggs hatching. Just sorry that some have struggled. Husband and I are thinking about investing in a Brinsea in the future.