I have built an incubator using a cooler and have 4 eggs in the incubator, hand rotating 180 every day, eggs tracking for between 12 and 16% weight loss(using a digital postal scale that I don't think is too accurate). Temp is in celsius on the pic of the controller on the outside. I hold 35.8-36.1 with the set temp at 36c. Pic inside is the 4 eggs inside with a pc fan with standoffs to allow air to be circulated across the incubator with a fan ptc heater combo on the left. Whole thing runs on 12v dc (because I live off-grid and 12vdc is more efficient than dc-ac-dc). I labelled the eggs 1-4 with arrows to know how to turn them for whatever side they are on lol. I'm on day 51. Egg one internally pipped last night and is still rolling all over the place chirping. Egg 3 is not far behind just as active but not pipped yet. 4 is wiggling but not as much and egg 2 is either a tiny bit of wiggling or not anything. Hard to tell when you are watching it very closely and start to think a breeze is movement as you hope it is ok.