This is what I use, it's accurate within 2%rh. For the price I found that to be decent. Once I got it I did the salt water in a sealed container bit to calibrate it exactly. Really easy and works great. It even fits in a widemouth mason jar and has magnets so you can just mount it on your tent poles.
If you want super accurate I've heard the oasis caliber iv cigar one is the best. I'm going to grab a few of those soon but I like the accurite too.
Buy the cheap ones and a calibration kit from Boveda. The Boveda kit is quick and will put the environment at a certain rh%. Just label each one with the +/- and they're good to go. I've tried all of them and even the good ones need to be calibrated.
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