What is used to observe the movement of the air in shooting conditions?

The correct answer, wind indicators, are specifically designed tools or devices that help a shooter assess the wind conditions in their immediate environment. These indicators can include items like flags, streamers, or even small windsocks that visually represent the direction and intensity of the wind. Understanding wind conditions is crucial for marksmanship because wind can significantly affect the trajectory of the bullet, thus impacting accuracy.

Wind gauges and thermometers, while related to weather conditions, do not provide direct, real-time visual feedback about wind movement as effectively as wind indicators do. Barometers measure atmospheric pressure and are helpful for understanding weather systems but do not indicate wind movement or speed. Therefore, wind indicators are the most useful for shooters who need to adjust their aim based on the current wind conditions.