This is an accurate, calibrated hygrometer. Check the specifications. Most hygrometers are not spec'd except here on Optics Planet. The readings on this hygrometer always agree with my dehumidifier. My other lower cost hygrometers are not accurate. I would buy this one again.
Pros: Good value, accurate, accurate
Cons: Needle sometimes gets stuck and needs a slight tap.
This review was written in the old system and had content requirements that are different than reviews written today.