Product review (4 stars): Large Margins of Error
*Update 12/20/17*:
On further review (I was re-reading manual to look for any calibration information I might have missed) I note a passage stating that accuracy cannot be achieved outside of 64F-82F (18C-28C), or below 20%/above 80% humidity...so broad swathes of common conditions (at least where I live) it cannot be counted on. The web page says 20C to 80C (-4F - 176F) which is *very* different, though it does note a margin of error +/-3%RH. What it all boils down to is this unit is workable for my application, and things like checking storage for wine/cigars or greenhouse conditions, but not for circumstances requiring wide operating range and fine accuracy.

Original Review:
I noted accuracy issues mentioned by another reviewer. Fortunately I am not in need of precise readings as I am using this to establish which areas of my home are too damp and need additional dehumidifying as I live in a tropical area in an older home with later additions. I wanted to be able to tell not only which areas are in trouble, but also progress and relative effectiveness of different dehumidifying methods (crystals, powered dehumidifier, forced air, etc,). This serves this task, as I only need to track trends, but still disappointing.