Dwyer ANE-1 Differential Pressure Anemometer Accessory for Manometer connects to any manometer and measures air velocity up to what the connected manometer is rated to measure. The Dwyer ANE-1 is constructed out of a durable ABS plastic, works in both directions, does not have any delicate electronic sensors or moving parts, and retains its accuracy as long as the ANE-1 is kept dust-free.