Inaccurate and Useless

I ordered 4 of these thermometers. After letting them set side-by-side on the kitchen counter for 2 days they are each still displaying a different temperature. One shows 72 degrees, one shows 73 degrees, one shows 75 degrees, and one shows 76 degrees. There are no external sources that are influencing them. They are just inaccurate and useless.

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