Check the listing for details. DWYER CONTROLS AIR VELOCITY METER MANOMETER MODEL NO. 400. Condition: Used. Listed at 79.99 USD. This Dwyer Controls Air Velocity Meter Manometer Model No. 400 is a reliable tool for measuring airflow and pressure in various industrial applications. The brand Dwyer is known for its high-quality products, and this meter is no exception. It is specifically designed for use in air flow and anemometer applications, making it a valuable addition to any toolbox for test, measurement, and inspection purposes. The meter is easy to use and provides accurate readings, making it a great choice for professionals in the business and industrial sector. Its durable construction ensures long-lasting use, and its compact size makes it easy to transport and handle. This Dwyer Controls Air Velocity Meter Manometer Model No. 400 is a must-have for anyone looking for a reliable and efficient tool for measuring airflow and pressure.