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[fishead]

Hey falconboy, stick your thermometer and thermostat probes right in amongst the egg mass mate. That's what temp is important. It will be hotter in the egg container than the main incubator as the eggs generate some heat. Just drill a hole in the side of the tub, stick the probes through and tape up the hole. Easy.
A degree or two is a fair bit of variation if you ask me. A pulse proportional thermostat is capable of holding a temp to within a couple of decimal points so why not use it to it's potential.