Product review (5 stars): Affordable, available, reliable
I really love these thermometers.  I have them in the house and barn to keep track of heated spaces, and they work like a charm.  The LCD is predictably slow when it's below freezing, but the high/low readings are there when you need them.

Not OK for outdoor use, but just the affordable ticket for indoors.  A good battery lasts well over a year.