Product review (1 stars): my unit is useless in practice
I wonder if there are counterfeits. It is not as pictured. My unit, packaging and instruction sheet have no name on them (other than a small inventory label haphazardly stuck on the back of the package), no country of origin and no warranty information. It does not meet the specs provided. It also exhibits what I call the "jitters." Leave in a stable location for an hour, turn it on, and the temperature will ramp up for minutes by several degrees F then bounce around over a 2 degree range, never stabilizing or coming close to a calibrated lab thermometer. Similar problems with humidity and dew point.  If given any two out of three (dew point, temperature or relative humidity) I can calculate the third precisely online. This isn't in the ballpark and does not even agree with itself. (I am obtaining dew points and RH from an international airport 5 miles away from NWS pilot information and temperature from a lab thermometer.)  RH from wet bulb and dry bulb? Unless used as a paper weight, my unit is useless in practice.