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An instrument that is commonly used on air distribution systems is the anemometer, or ____.

  1. Psirometer

  2. Manometer

  3. Velometer

  4. Thermometer

The correct answer is: Velometer

An anemometer is a device used to measure the speed of airflow in an air distribution system. Among the choices provided, a velometer is the instrument that specifically measures the velocity of air. A psirometer is not a standard tool in HVAC systems, a manometer is used to measure pressure, and a thermometer is used to measure temperature.