Product review (2 stars): Definitely not "accurate", as there is significant variance between the two and with two other thermometers I have
These temperature and humidity monitors can be off by a few degrees or a few percent.  That seems like an awful lot of room for error, to me.  (A house at 70 degrees is quite different from a house at 65 degrees, and you can't be sure what is right with these.  Also, the low/ok/high humidity indicator doesn't work on one of the two I received.  At 55% it says "low".  At 56% it says "high".  Never says OK.  (Photos attached)  The other one seems to be doing better, but I have it in a room where it hasn't gone to high humidity yet.

As is typical with cheap products like these, it isn't worth the cost to ship them back for a refund.  For now, they serve some purpose for me in keeping an eye on humidity in two different rooms, but I really don't trust these as accurate.