I will respond to the Accurite section for the OP since I feel Connie represented the rest of the post extremely well.
I have 14 Accurites- well, 13 now since one was plopped into a sink filled with water
With good batteries inside they all read within an acceptable range of each other; one or two degrees and very close humidity. I count on the Accurite to give me a quick glance of the ambient temps and to give me a humidity read. I have a temp gun for spot on temp accuracy. I know that my humidity is within what the unit says because my snakes shed perfectly every single time and that is proof enough for me.