Product review (5 stars): 100% Accurate For Temperature And 99% Accurate For Humidity
I have owned several different Temperature/Humidity meters over the years. Since every room in the house has a different humidity reading depending on how many windows are in the room or which direction it faces, we always like to know the humidity to keep the rooms all more normal and similar. We have the worst humidity in a bedroom on the north wall with large windows. For anyone with any collectibles, keeping the humidity out of the room means not damaging your collectibles or items from too much damp or mildew.

My brother has an expensive weather meter system, as he has a large collection of remote control planes- many fabric made, so I always have something 100% accurate to compare my meters to. This Amprobe Relative Humidity & Temperature Meter is actually the most accurate meter I have ever owned. We tested this inside, outside, even in crawl spaces and duct work to see the results. The temperature was always 100% accurate, whether it was ambient, dew point or wet bulb.

As for the humidity temperature readings- we found this Amprobe to be off by 1/2 to 1 % depending on where the reading was taken.  Inside duct work- it was off by only 1/2 %, but in a room or outside it was off by 1%.  This is the most accurate meter I have ever owned. I had owned a Pyle meter that was always off by 6-10%, and a Fluke that was off by 4-6 % on the humidity readings. My best meter before this Amprobe was made by Ambient Weather- the humidity was off by just 2 %. The temperature readings on all my meters was always pretty accurate- it's the humidity readings that are never completely accurate.

This Amprobe THWD-3 Relative Humidity and Temperature Meter comes with the meter itself, a removable protective metal sensor cap, black carrying case with belt loop, 9 V battery, User's Manual and a Wet Bulb Chart. There is an On/Off Switch- which automatically turns off should you forget to turn it off after 30 minutes. The Min/Max button allows you to use it for memory. The Hold button allows you to hold the present reading. The DP/WB button gives you the Dew Point Temperature or Wet Bulb Temperature- which came out 100% accurate. The last button is for your readings in either Celsius or Fahrenheit temperatures. There is also a Low Battery Warning picture.

Besides being the most accurate Temperature/Humidity Meter I have owned to date, I found when you remove the protective metal sensor cap, the reading is given in a few seconds- way faster than with the cap on. You just have to take more care that the sensor is not damaged when the cap is off. This is a great, well made, extremely accurate temperature and humidity meter and is definitely worth 5 Stars, being the most accurate meter I have ever owned, and Amprobe even warrants this meter for a year, making it well worth buying.