Product review (2 stars): Sadly, a disappointment
The dew point cannot be manually set or calibrated.  Tracking the dew point is very important to me.  Not sure the barometric pressure is working correctly either.  The "forecast" depiction (e.g. sunny to stormy) is always off, perhaps due to the dew point and barometric pressure problems.  Humidity must be more than 29% during a rain storm - right?.  I have calibrated the humidity twice already - still not working.  All instructions followed exactly.  Ouch - this was a costly mistake.  Always buy where you can take it back to a real store.