Product review (4 stars): Suitable for my purposes
I needed this to control temperature in a chest freezer for kegging homebrew.  It is an analog, single-stage temperature controller tunable from 20-80F.  The piece of information missing from this page is that it has a 3.5F variance, meaning that if you tune it to 40, it will vary from 38.5 to 42 or so.  The variance is NOT adjustable.  I had to set the control a little low to achieve the desired temperature, but it's been working like a champ since.  It is probably not the highest quality controller, but it does the job I need it to do in a comparably cost effective way.