I would like to comment on the fI 4250 incubator. We bought this unit @ tsp in April of this year- 2018. It seems to be accurate for heating. The free candling light did not last 1 hatch. Very junky. Our third hatch, which is right now we realized a few days ago, (a week into the 35 days for geese) that the egg turner seem to be humming kind of loud. When I checked it, it was humming and causing a vibration I could feel in the eggs. I shut it off and have been hand turning the eggs 4 or 5 days. I thought, I hope that has not caused a problem for the eggs. Today we checked them for activity. I see what I THINK may be 2 clears and 2 quitters. we only had 4 American Buff eggs. Sad if its true. I don't recommend this unit. Not a good choice.