My conundrum is, from what I can tell I want one with a probe to insert into the tank since I don't see how ones that are just the device itself will work since it'll either (ironically) get messed up by the humidity and/or will just constantly get knocked over by the snake. Or if it's a stick-on-the-wall type then it runs the risk of falling off and getting stuck to the snake as expressed before. But it seems like all the ones with the probe(s) that I look at are either way above my price range (which is $20-$30 or so) or are riddled with middling to negative reviews about how they work only for a month or are inaccurate from the get-go.