How to identify Hot Spot in cold room

How we can identify hot spot in cold rooms during validation .

Which method will be more accurate i.e. No. of occurrence / Average Out / Max. temp.

Pl. suggest

You can perform temperature mapping studies in the cold room to identify hot spots and cold spots. This should be performed at two conditions, empty load and fully loaded conditions according to written plan or protocol. There are WHO guidelines available for these studies as well as for Qualification of (cold) storage areas.

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