Product review (4 stars): exactly what I wanted
I have the latest version of this meter, with the words "Humidity Alert II" across the top. As far as I can tell, the only difference is the provision for temperature readings of 100 or more...notice the additional empty space to the left of the displayed temperature on the "II", compared to the original. Both share the same model number, however.

Right out of the box this unit was correct on dew point. I checked it when all NOAA weather stations in the immediate area were reporting the same dew point (I had the unit outside). For this reason, I've had no need to adjust the calibration controls.

The quick response and sensitivity of this unit are remarkable. With it standing on a table (it has a plastic support that folds out from the back for that), when I put my hand near it to operate the RESET or MAX/MIN buttons, the indicated dew point will begin to rise in a few seconds, responding to the moisture from my skin. For this reason, it would be a good idea to put the probe well away from the body of the unit - so that you can handle the unit without disturbing readings.

The display is easily read from any angle.

The only reason I withhold one star from my rating is the RESET and MAX/MIN buttons are quite stiff so you need to hold the unit securely in both hands to depress them. If the unit were securely mounted on a wall, this wouldn't be a problem. Front mounted, softer touch switches would be an improvement.