It is:
To find out whether your freezer has turned off and then come back on again when you've been away, which would thaw and then refreeze your food (not good as it will make you ill), fill a glass jar with about an inch or two of water, then lay it on its side in the freezer until it freezes. Once frozen, stand it upright.
If your freezer does play tricks on you, you can catch it out by referring back to the glass jar. The frozen water will now be at the bottom of the jar and not frozen to the side.
Ta-daa!
Simple, quick, and inexpensive! Save ya a few bob on food as well.
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