To test it, a thermometer on a thin rope should be lowered into the cargo hold through specially constructed temperature measuring pipes. These should have holes at regular intervals and reach almost to the bottom of the cargo hold.
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'Dew Point Rule'or 'Three Degree Rule'The Three Degree Rule states that a cargo hold should be ventilated when the dry bulb temperature of the outside air is at least 3°C lower than the temperature of the cargo.
Doing your pre-start scan, the temperature controller for the cargo holds is usually just left at 12 o'clock. That should result in a zone temperature of about 15C.