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Purpose: Measure atmospheric pressure. Description: A barometer has a sealed chamber with a vacuum or a fluid like mercury that responds to changes in air pressure. As atmospheric pressure changes, the level of mercury rises or falls, translating this movement into a numeric value.

Purpose: Measure wind speed. Description: The most common type of anemometer has three or four cups attached to horizontal arms, which are mounted on a vertical rod. As wind blows, the cups capture the wind and rotate, with the speed of rotation being proportional to wind speed.

Purpose: Measure the moisture content or the humidity of the air. Description: There are several types of hygrometers such as hair hygrometer where human or animal hair length changes with humidity, and electrical hygrometers where changes in electrical resistance with moisture are measured.

Purpose: Measure the amount of liquid precipitation over a set period of time. Description: A simple rain gauge is a cylindrical container that collects rain, with markings on the side that indicate the amount of rainfall usually measured in millimeters or inches.