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Question:

A cold storage unit must have a reliable thermometer. Where should the thermometer be located?

A Near the warmest part of the unit
explanation

A cold storage unit must maintain a temperature of 41°F or lower. If the warmest part of the unit is 41°F then you can be sure that the rest of the unit is also that temperature, or lower. The warmest part of a cold storage unit is usually up high, near the door, and away from the evaporator fan.