Product review (4 stars): Meter works OK; On Your Own for Setup and Operation
This is a small, light meter that seems to work OK.  I think the temperature reading are pretty accurate, but I have other humidity meters, and my guess is this one is accurate to within 5-8% or so.  The real challenge is getting this meter set up.  It comes with a tiny sheet of unhelpful instructions.  Deciding how to install the battery, if you can find the battery compartment, is an interesting exercise.  It would be easy to break the battery connections if you don't guess correctly.