Final answer:
When performing tympanic temperature assessment, the nurse should instruct nursing assistive personnel (NAP) to put on a new disposable probe cover for each patient to prevent cross-contamination.
Step-by-step explanation:
The nurse might give the instruction to nursing assistive personnel (NAP) to put on a new disposable probe cover for each patient when performing tympanic temperature assessment. This is important to ensure proper sanitation and prevent cross-contamination between patients.