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Needed calibration out of the box, but most of these analog hygrometers do. No real complaints other than that.
I keep track of humidity because of musical instruments. I did the salt calibration to set it right.
Will update if I have any problems with measurements, but I don't anticipate any. A fine unit. Bonus is that it came with a magnet with an adhesive back which gave lots of options for affixing it.
One received in perfect condition, the other one damaged.