The inch is everything combined. Couldn't figure out a clear way to say that. I suppose the word "combined" might have helped.

I'm measuring the temps with the AcuRite probe on top of the substrate in the hot hide. Literally where the snake lies. As far as I've read, it should be on the glass underneath everything or on the UTH outside the tank. I've put it where I have because I want to know what the snake is feeling, rather than the out-of-control UTH, which I know is way too hot.

You're right about the liner. I had forgotten why we had even gotten it: solely to keep the snake from getting burnt. Think it can with the liner in place? I wouldn't think so unless it gets underneath, but we're trying to keep an eye on it. I check everything about every half-hour that I'm home and awake.