I just got one last week, and I tested it on my incubator(which is empty) to see how it held temps. Must say, it only fluctuated about 3 degrees at the most. And I do not hear it turn on and off, so its not annoying! But, when I get eggs I will be putting the Herpstat II on the incubator and the Hydrofarm on the small rack.
So far, so good!
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