Master Mechanical License Test 2025 – 400 Free Practice Questions to Pass the Exam

An anemometer is the appropriate tool for measuring airflow in duct systems because it is specifically designed to gauge the velocity of air moving through a specified area. This instrument can provide readings in units such as feet per minute (FPM) or meters per second (MPS), which are essential for assessing the performance and efficiency of HVAC systems. Proper airflow measurement is critical for ensuring that heating, ventilation, and air conditioning (HVAC) systems are functioning effectively and distributing air evenly throughout a space.

Other tools mentioned have different purposes: a barometer measures atmospheric pressure and is used for weather forecasting and altitude calculations; a thermometer measures temperature, which is crucial for understanding heat transfer but does not measure airflow; and a hydrometer is used to measure the humidity or specific gravity of liquids, not air. Thus, the anemometer stands out as the correct choice for measuring airflow in duct systems.