Hi, I build a home made incubator and just started a batch last night. The temp was pre-stabilized and the humidity is 55% currently. Although I have one of those cheap temp sensors for indoor outdoor temps. It reads 100 on the unit and about 98.8-90.1 on the probe that is under one of the eggs furthest from the light. I also have a stove temp sensor that is in the incubator leading to the display on the outside. I use that just to double check the other and it's reading 101 degrees. Does the low temp under the egg sound ok or should I bring the temp up a little to get at 99.5 under the egg? I figure it's only been 24 hours. Once the eggs start development then heat will rise under the egg? I also have a 60watt bulb, idono if that matters.