I built and tested an egg incubator, it holds very good temperature at 99.2* - 99.7* My first time in the incubating world will be bourbon red turkey eggs. They range in weight from 70 G up to 87 G I weighed and marked the weights in grams The thermostat turns the heat on and off many times per minute, so I am confident that the temps are holding very steady. I built a crude but working egg candler Testing it out with a white chicken egg I made it portable so I can go to a dark room for this. Even with schedule 40 PVC the light was bleeding through, so I wrapped it with electrical tape. (Didn't have paint on hand!) The incubator has 50+ 1/2" holes that can be plugged for controlling humidity levels. The Filler tube with funnel and plug for adding water without removing the top I will be adding a second light and reducing the wattage to two 40's but for the moment I just have one 75er. I made this from parts laying around, the only cost is the egg turner, generic great stuff expanding foam, and thermostat. The thermometers and all other parts I either had or found. I used shelving standards to make the egg turner height adjustable, and also I have hardware cloth framed to place in it under the egg turner for when the egg turning period is up. If I ever needed to, I could add a second egg turner for a total of 82 eggs being incubated at one time.