Product review (4 stars): Dew point Review
This instrument seems to work just fine. The only reason I did not give 5 stars is that it has to be calibrated by a lab from time to time. All instruments of this type have to be, so I cant vouch for its accuracy. But I have NO worries on this score.
Its nice to see the humidity and dew point as a day may seem a good one to do heavy work but it will be unpleasant ( sticky) above a certain dew point/humidity even though the temperature may be quite cool. You soon get used to seeing if its a 'good day' or not.