Here is the one I have. I kept it in my kitchen for several days before I put it in the tank and tested the probe temp with my temp gun. It was within 1 degree each time I checked it. I have no way to see if the humidity side of it is accurate but it appears to work because it goes up and down when I cover or uncover the tank and when I mist it it goes up to around 80 and as me CHE is running it will drop down over the day or two. So I assume it is close as well.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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