I have one with a helix thermostat and it works great. As it is set up upon purchase, it will hold a pretty fair number of shoebox sized egg boxes. I recently switched to larger egg boxes so I had to remove the wire shelves to accomodate them, but it is still working and holding temps just fine. One word of advice is be careful if you're moving the incubator around. I managed to put a substantial crack in the bottom of mine by sliding it across a hardwood floor to clean behind it. Looks like it shouldn't be at all difficult to fix once hatching season is over. (It's still holding temps with that crack in it, too)

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