A flow meter is a device which is used to gauge gas or fluid flowing through it. http://www.silverinstruments.com/ultrasonic-level-sensor.html

1. A flow meter is a device which is used to gauge gas or fluid
flowing through it. They are used in a variety of applications
where measuring flow is needed to check for leaks, control
pressure and even prevent asthma attacks in asthma patients.

2. Paperless recorder
The devices are categorized based on driving systems with
mechanical, ultrasonic, pressure and electromagnetic being a few
examples.

3. Mechanical flow meters are traditional devices which are still in
use. The basic types use turbines or wheels which are inserted
into pipes to measure velocity and also to calculate volumetric
flow by using the area on the pipes they are located.

4. ADDRESS
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China
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