phoenix912 has a very good point.
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I have two digital Walmart thermometes with humidity in mine. But I also made sure I read the back and see how much the +- was. On some thermometers the +- can be as much as 3 degrees which is way to high for hatching eggsi have a digital thermometer with humidity but i do not think it is all that accurate but no fan installed, Any ideas on a good thermometer?