What's a good humidity gauge that people use? I have zoomed one it wasn't super pricey but I want to keep up with the accuracy. It's getting colder now and I'm trying to maintain heat in my sulcata' tank. I have foil at the top but the Temps just aren't as high as they used to be since it's getting cold. The humidity gauge has dropped down to 50% but the substrate is still moist. How can I count on accuracy if it's 50% but I see that the substrate has moisture