Title: Inaccurate unit
Review: I have bought 4 of these from Amazon. I have calibrated all four for temperature accuracy and they all consistently read the same within acceptable limits. However, with one of the units I cannot adjust the relative humidity. I cannot correct the humidity reading with the adjustment. The dew point reading depends upon the accuracy of the relative humidity and so the dew point is in error. I need a good dew point reading to prevent mold in some air handling equipment so this unit forces me to guess on its error and estimate the dew point. Not a good feeling. Some people might think three out of four is not bad but I don't see why I have to put up with the time and trouble caused by poorly manufactured and tested products! One star, less if I could!
Is this product review negative?