I have an electronic sensor inside of my terrarium which is hooked up to a Repti Fogger for humidity control, and I also have a Zilla temp/humidity gauge stuck in there. Even when they're side-by-side, the sensor will read temperatures about 5 degrees higher than the gauge, and humidity about 15% higher. So, for example, if the sensor says that temperature is 90 F and humidity is 65%, the gauge will say 85 F and 50%. I've since moved the gauge to the cool side of the tank just to get a general idea of the temp over there, and I've left the sensor on the hot side to make sure the air doesn't get too toasty.

My question, though, is this: which would you say is more accurate? Although the sensor is more expensive and high-tech, I'm inclined to trust the cheap plastic gauge since it ISN'T electronic and is thus probably less likely to screw up...

I'm not really concerned, just more curious. I've been using my own intuition and what I've gathered from observing his behavior to determine what changes need to be made, if any.