Simple RV Freezer Monitor Device

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Put a single ice cube in a paper cup and leave it in your freezer and check it daily to be sure there had not been a power failure at the campground while you were away for the day, or that nothing else has happened to cause the frozen foods to partially thaw and re-freeze again.

If the freezer has been working well, the ice cube should retain its original shape. If it has melted and re-frozen the ice will be puddled in the bottom of the cup and chances are that the quality of your food in the freezer and refrigerator will be comprised.