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Duct tape, a thousand and one uses. If you need to know if your freezer thawed out you put a cup of water in and let it freeze. Then put a washer/penny on top of the ice. If the freezer thaws out the ice melts and the coin type item falls to the bottom of the cup and will be there when the freezer turns back on and refreezes. This way you know if your not home and the power went out and the food/medicine thawed and are bad.
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