I'm sorry, but I would never use an analog thermostat to control a ball python egg incubator. Their eggs are TOO SENSITIVE. Other species can withstand more fluctuation, but not ball pythons. You go this route, and the worst that can happen isn't that you lose them....it's that they hatch, and they're all one-eyed, kinked, and fused.

You can get away with using analog thermostats to control heat in a rack, especially if you use a particulate bedding like cypress mulch, but you really need a good proportional thermostat for your incubator.