Why you should always put a coin in a frozen bowl/mug of water in your fridge.
My take would be a small Pyrex container - no cracks or breakages in freezer!!
Method
Take a bowl/mug and pour in some water and keep in your freezer.
Freeze it solid and then put a coin on top of it and leave it in your freezer.
If you lose power for any reason you will have this tip to fall back on. This will show you if your fridge had gone off whilst you were away for the day.
If the coin has fallen to the bottom of the bowl/mug that means all the food is defrosted and you should throw it out. But if the coin is either on the top or in the middle of the mug/bowl then your food may still be ok.
That way when you come back after you spent a day or few days away from home you can tell if your food went completely bad and just refroze or if it stayed Frozen while you were gone.
It would also be a great idea to leave this in your freezer all the time.
trial and error- NEVER put a glass bottle in even if it is not sealed!
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