https://www.amazon.com/dp/B0013BKDO8/
I have 4 of them so I can monitor different rooms. Have been using them for many years.
Will tell you the current temperature and humidity. Plus what it was in the last 24 hr.
I believe it is fairly accurate. Watching the humidity indoors in the winter is very important to me.
Runs on one AA battery - I use rechargeable, of course. C/F switch on backside. Gene
