I would think the temperature in the egg tub would be a couple to a few degrees different. The space in the tub proper is a lot smaller than the incubator thus that would be a possibility for the difference. I would also consider using a temp gun for more accurate interpretation of temps going forward. Areas of heat tape may have subtle differences in heat generation from one section to another. 3 degrees is not a very big difference at all. Temp gun for the consideration. Grats. Consider placing the thermostat probe sensor onto your heat tape.
Stay in peace and not pieces.
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