Product review (5 stars): Does what it does and does it well
This item basically measures four things with near-immediate feedback and, I presume, accuracy:

1) temperature in degrees C or F;
2) relative humidity in percent;
3) "wet bulb"; and
4) dew point.

The device controls are intuitive, so it took five minutes or less to learn, explore and try out the various device options.  The most complicated was recording two sets of data for comparison . . . and that was quite straightforward.

It's a breeze to use and is solidly constructed.  Great for lab/engineering use.  Probably great for those in the HVAC business, too.