Appropriate Enclosure Set-up?

I'm back! With a new and parent approved pastel ball python. I've had her for a month give or take. She's been eating regularly(rat crawler once a week). Her first and only shed came off completely intact. She's still pretty small and I just want to make sure her enclosure is an appropriate size. She's around a foot and a half, her enclosure is 25"L × 18"W × 7"H. It's a Sterilite plastic tub

Enclosure contains:
2 hides, one small UTH, medium water dish, thermo-hydrometer, repti-bark substrate

Only questionable thing is how are you regulating the UTH and/or verifying the UTH temps?

Century thermostat (: