Originally Posted by Eric Alan Neither. It should be on the outside of the enclosure sandwiched between the UTH and the bottom. If you've already stuck the UTH to the bottom, you can use tape to secure the probe flush against the under side of the UTH. Placing the probe in this way keeps it out of "the elements" so it can do its job properly and keep your animals safe. But wouldn't that make the top of the substrate quite cool?
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Originally Posted by Eric Alan
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