A Hovabator with the wafer thermostat removed, the top vent hole blocked, and connected to a Herpstat thermostat, is what I'm using this year.
I have it set up with substrateless incubation, and I fit FIVE clutches in there. Not small ones, either. I put the water directly in the included plastic base, and put the light grid over top of that--no separate containers.
3 clutches have hatched out in that setup so far, and not a single loss of any egg in there.
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