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Walmart has indoor/outdoor thermometer with a hygrometer included for about 15 bucks. Mount it to one side of the viv (includes screws or a sticky pad) and just run the probe to the other side, and keep both about one inch of the substrate. That's about what I do for ambient temps. As far as heating the cool end, put a vent in the warm side, down low, and a vent in the cool side up high. Hot air rises, so it will help pull some warm air over to the cool side, and it sounds like you can afford to pull some heat away from the hot, or at least the heat bulbs will be able to maintain the hot if you pull heat away.
My other two cents on the issue, should be a bigger viv. At one year, I'd just build one big enough for when she's full grown and include a few extra hides. A lot easier than having to go through the whole process again. Then again, when she needs a new viv you have one ready for another critter. :shrugs:
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