Product review (3 stars): OK but check accuracy
I bought four of these and set them all up side by side to check accuracy/consistency: one of them had a humidity reading 13% lower than the average of the others, which were within stated tolerances. I complained and Amir did replace that one free of charge, but the replacement didn't work at all.  They also replaced that one free of charge.  So, if you purchase just one, you may not know much about its accuracy unless you have a way to check it. A bit of a hassle, but at the price I suppose overall OK if you need a bunch of them. AMIR was at least responsive with replacements.