I'm so glad you asked this. I'm using an LG forced air and I might as well be sitting on them myself. After the first hatch was a disaster I took out the automatic turner and set a timer to check the temp every half hour. It really varies. I get up in the night at least three times and if it's low I'm real reluctant to move it up at all because it will spike to 102 in no time. Last night it was under 99 all night.
People said they love their
Brinsea so I got one of those and everyone hatched a couple of days early so I know it ran high. If you follow the threads of people who have the small
Brinsea their hatches aren't great. Mine had black mold in the water well after a couple of weeks. Never had mold in the LG.
I'm thinking about getting one that is $119.00 on
EBAY but someone was talking about less than stellar hatches with it and they don't know why.
In the Kindergarden classes they use Lyon. They're a little pricey but you can get them on
EBAY and they have a good view of the eggs and good hatches even being left alone on week-ends. I might go that direction.
Would love to hear input on this or even when people have great or horrible hatches mention what they are using.