The BERMAD Hydrometer with solenoid control combines a turbine Woltman-type water meter and a hydraulically operated, diaphragm-actuated control valve. It functions as both a mainline flow meter and a solenoid-operated valve, opening and closing in response to an electric command from a control system. The Hydrometer features a magnetically coupled, vacuum-sealed register for precise volume measurement. An optional pulse output enhances system capabilities.