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Does not work. After following the instructions to the letter T.
Still does not set right.
I’ve got an older humidor that was my brother in laws. It had a analog hygrometer and it was off by at least 10%. This fit the bill , now I know the correct humidity and temp.
I like this hygrometer, however, the instructions for calibration are horrible. According to the instructions there was supposed to be a plastic bag to put it in, there wasn't. Also, the adjustment to get the final calibration did not work. Still not sure if it's entirely accurate but it matches my other hygrometer so I'm guessing it is.
The hygrometer was well packed and arrived safely. The included battery had a little tab that prevented current drainage prior to use. I haven't calibrated yet but like the fact that that's available.
HygroSet Super Accurate Digital Hygrometer