Negative Positive
Title: Cheap and without even the slightest hint as to how to calibrate it
Review: I bought this but have absolutely no faith in it. Maybe it is such common knowledge no comment is required, but really one of the virtues of analog hygrometers is that they can be periodically readjusted or calibrated--but not a peep about how to.Looking at the so called screw used for calibration, I'd be afraid to. I'm open minded enough to amend this review should it turn out to be reliable, but for now 2 stars seems generous.Update: Still not sure how reliable it is--but after calibration, not with salt water, but with damp cloth wrapped around the instrument for 30 min, used the screw to set at 99-100%, seems to be tracking reasonably well and agrees with online weather reports +/- 5% when placed outside. So maybe a bit better than I first thought.
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