Rotameters Technology

Variable Area Technology

Over sixty years of variable area meter expertise

Brooks started designing and manufacturing variable area flow meters, also referred to as rotameters, in 1946. Now, with more than six decades of application experience, we help customers with variable area flow meter solutions in just about every industries. Our solutions have come from our standard portfolio as well as custom-designed products incorporating special material construction, connections and pressure ratings.

The Brooks line of glass tube and metal tube variable area flow meters ensures measurement repeatability, which provides dependable flow monitoring and consistency. External power is not required for operation; therefore, they provide a fail-safe flow indication under any circumstances. Brooks variable area flow meters can be provided with a variety of wetted materials for high-pressure, high-temperature conditions and hazardous locations.

Armored VA Meters

The Brooks line of rugged metal tube variable area flow meters is ideal for high-pressure, high temperature and other demanding flow applications where safety is a concern. HART and 4 – 20 mA outputs and limit switches provide for remote flow monitoring.

Glass Tube VA Meters

The Brooks line of reliable glass tube variable area flow meters is ideal for gas and liquid flow measuring applications where viewing the process is desirable.


The Brooks Sho-Rate™ brand of variable area flow meters delivers industry-leading performance for gas or liquid flows. Robust engineering ensures reliable indication and unsurpassed service life.