I have 3 digital thermometers in there with probes. That's how I am getting the temperatures. I also have a digital withhygrometer. The humidity is about 70%. I have a board over most of the cage blocking the screen. Most of the cage, about 80% is between 85-95%. The area on the far end is cooler. I guess I will put my smallest uth on that end and see if it brings it up to an acceptable level. I was thinking that from right to left 75% - 85% - 95% would be a good gradient for him