Title: Must be calibrated
Product review: The instructions don't say anything about calibrating the unit but it can & must be calibrated to have correct readings.The clear lens rotates to change readings,they are stiff but they will move if you use a wide rubber band around the edge of the lens,maybe a rubber glove would work also,just something too get a grip on the lens without crushing the plastic.Hold the unit in the palm of your hand & turn the lens to the correct temp using a known accurate temp gage.Same thing for humidity gage except:use a shot glass or similar container with table salt & enough water to make a slurry like wet sand,put gage & salt/water slurry in a zip-lock bag & seal it up for a few hours,humidity should be adjusted to 75% by turning lens. Ive had this gage for a couple of weeks now & after adjustment it works as good as my electronic meters just not as fast & its only $10.So to all the bad reviewers,calibrate it & stop fussing.
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