What is the best way to know if a refrigerator is keeping TCS food at or below 41°F?

Using a food thermometer to check the temperature of TCS (Time/Temperature Control for Safety) food is the best method for ensuring it is kept at or below 41°F. This approach provides accurate readings of the actual temperature of the food itself, which is crucial for food safety. External displays may not always reflect the internal temperature of the food accurately, as they might solely indicate the air temperature within the refrigerator. Frequently opening the refrigerator door can lead to temperature fluctuations, compromising food safety by allowing warmer air to enter. Relying on the manufacturer’s settings is also unreliable since these settings may not account for variations in food placement or the types of food stored, which can affect how temperature is maintained. Therefore, using a food thermometer directly on the food gives you the most reliable information for maintaining safe storage temperatures.