Accurate!
I was most interested in the humidity measurement. I conducted a calibration****(See update at end of review) with a sling psychrometer. A sling psychrometer measures wet bulb/dry bulb temperature and is the least expensive (albeit a bit tedious to use) and most accurate way to determine relative humidity (RH).
I needed to know relative humidity for curiosity indoors and for a chamber in my basement used to dry cure sausage (I needed a 70%RH environment). The Honeywell unit was spot on with the sling psychrometer (and temp. was accurate as well).
The unit is new; I need to check it over time for accuracy. However it's running very well so far and the price is right. I'll be buying more remote sensors [...] I found the remote sensor part no. is TS33C can find them on Amazon with that search).
The majority of complaints say the humidity is "off." However I didn't see a single valid calibration conducted.
Update 01-March-2009
I just took the main unit the sensor and sling psychrometer. The conditions in my home at time of testing were 68F and 30% relative humidity.
Main unit read 68.4F/30% RH
The Sensor: 68.0F/30% RH
Sling Psychrometer: 68F/31% RH
The sling psychrometer consists of two sealed thermometers and will never need a calibration it is an accurate standard. This Honeywell Unit is pretty darn good.
Update 13-Dec-2009
Someone contacted me and corrected a big point. I did not calibrate the unit by adjusting it to a known standard I simply compared the values. My apologies for this rather serious error.More detail ...
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