American Meteorological Society Certification (AMS) Practice 2026 - Free Practice Questions and Study Guide

An anemometer is the instrument specifically designed to measure wind speed. It typically consists of rotating cups or blades that spin when the wind blows. The speed of rotation is directly proportional to the wind speed, allowing for an accurate measurement. This tool is crucial in meteorology for understanding wind patterns, which can influence weather systems, temperature distribution, and even forecasting severe weather events.

In contrast, a thermometer is used to measure temperature, a barometer measures atmospheric pressure, and a hydrometer measures the density of liquids. Each of these instruments serves a distinct purpose in meteorology and is not equipped to gauge wind speed like an anemometer is, which is why the anemometer is the appropriate choice for this question.