I bought myself an Acurite for $12 from Wal-Mart. Thanks for the recommendation!

Now, I have 1 but should I go back for a second, so that I have one on both sides of the cage? Or should I just use it like a wand and use it to check both periodically?

For the UTH, I think I'll get the Hydrofarm off of Amazon since it keeps getting recommended.

For the probe I'm assuming I place the probe just above the substrate for "ground" level humidity and temp?

And for the Hydrofarm, do I place the probe under the substrate on the glass, between the UTH and the class, or under the UTH?

Again, thanks for the replies! Really helping me here.