Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Broken out of the box

Bought one of these a week ago at Meijer. Opened it tonight and read and followed all the instructions. It failed the very first self-test - the unit only displays "Err". (The instructions helpfully suggest that this means the ambient temperature is not between 60 and 98 degrees F - I'm pretty sure the temperature in my house is in that range, Mabis.) Tried replacing the battery - no better. The unit is just junk.