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I bought this digital room #thermometer six months ago. I wanted to check to see if my Nest thermostat was accurate (it is).

Anyway, I like having it in my room because I can quickly glance at it to see the temp and humidity.

After six months, the battery needs to be replaced. I'm kind of surprised that it only lasts six months. I think it should be 2 years at the minimum. It takes a lithium CR2032 #battery. That thing must really drain it.