Product review (3 stars): not all so acurate
the alarm sounds even when is a little too cold on a refrigerator and still sounds on a freezer even if is 15 above 0 still very cold but I guess not as cold as it should be . So would I keep using it?  yes would I buy them again maybe not also the outside temperature is all diffrent even if they are next to each other the glue on the tape comes off very easy so I had to go and buy super glue to glue them to the unit ..  Sorry if is not a good review but that is how they all work Also the suction cups hardly stick to the metal so I have to wrapped them around the wire to hold it in place