For thermometers everyone here essentially uses AcuRite, and for good reason because it's pretty accurate! Get one with a probe - I have one with a probe that tells me the probe's temp and the temp/humidity of the actual unit. Then you could put the probe under the substrate on the hot side and the actual unit on the cold side; it's really efficient
And I use a UTH from ReptileBasics, an Ultratherm I think? I don't know too much about other ones though, but I use this UTH for my new bp as well as my hermit crabs lol
Edit: the UTH I'm talking about is in one of the above links ^_^
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