Final answer:
Every vaccine storage unit must have a TMD to monitor temperature and ensure vaccine integrity. This is critically important for maintaining the vaccines' efficacy and preventing spoilage.
Step-by-step explanation:
The question is inquiring whether it is necessary for every vaccine storage unit to have a Temperature Monitoring Device (TMD). The accurate answer is true, as a TMD is crucial for monitoring the temperature within a vaccine storage unit to ensure the vaccines are stored at the appropriate temperature. Reliable temperature control is vital to maintain the integrity and efficacy of the vaccines, thus preventing spoilage and ensuring patient safety.