Final answer:
A hygrometer is the correct instrument used to measure humidity in the Sterile Storage area. It is specifically designed to detect the moisture content in the air, unlike thermometers, barometers, and pyrometers which measure temperature, atmospheric pressure, and infrared radiation respectively.
Step-by-step explanation:
To measure humidity in the Sterile Storage area, the correct instrument is a hygrometer. A hygrometer is specifically designed to measure the moisture content in the air, which is known as humidity. While other instruments such as thermometers, barometers, and pyrometers are used to measure temperature, atmospheric pressure, and infrared radiation respectively, they do not provide a measure of humidity.
Thermometers are better suited for reading temperature through materials that expand or contract based on the thermal changes. On the other hand, barometers are used to measure atmospheric pressure, which can be important for predicting weather changes but not for measuring humidity. Lastly, a pyrometer measures heat or temperature through the emission of infrared radiation, which is not related to humidity measurement.
Therefore, when it comes to ensuring the proper environmental conditions in a Sterile Storage area, a hygrometer is the tool needed to monitor and maintain the correct humidity levels.