Product review (5 stars): A professional quality RH and temp probe that exceeds specs
First, I am not a pro, but I think any professional would fine this meter more than adequate. The best I can tell, it exceeds it's specs in every area as far as accuracy and it delivers results very quickly, is easy to use, and seems to be well made. It comes with a case and a protective cover for the sensitive probe tip. Also included are a chart, manual and 9-volt battery. It has an auto-off feature to preserve battery life and easy to use button controls.

It has Min/Max capability (will store minimum and maximum readings until you clear) and a HOLD capability so you can "freeze" the display reading.  It also has Dew point and Wet Bulb readings via a separate button if you need them. Finally, you can toggle between Celsius and Fahrenheit.

Besides being very easy to use, what you are paying for here is accuracy and quality, and I think you are getting that. The THWD-3 has no flaws, as far as I can tell, and is an easy 5 stars for accuracy, quality, ease of use, and value.