Dial hasn’t moved since I received it

Just received this 3 days ago and the dial has not moved from 70° mark. I’ve had it both in open air while pretty warm out and in my compost pile for 2 days now and no change in temperature. I question the accuracy and am not sure if this is even functional. Will return and try another brand. I have added one star for eco friendly packaging- cardboard box, no plastic!

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