Product review (4 stars): OK for budget digital thermometers
These are OK for budget digital thermometers.  Relative to my higher quality digital thermometer (by Extech Instruments, a Flir Company), one of of these is right on, within +/- .2 degrees, while the other three all read 1.1 to 1.5 degrees low.  Humidity-wise, they all read 5% to 10% higher than the Extech in our current dry winter air.  Right now, the Extech says 38%, while the Ambients say 43.6% to 46.0% relative humidity.  (I've checked my Extech against a good mercury thermometer, so I trust it on temperature, but I've never verified its humidity readings.)  The LCD display on these Ambient's has pretty fair contrast, and stays fairly readable up to about 45 degrees off-center.