Mass Flowmeter, or MASS FLOW METER (abbreviated as MFM), is an instrument for 

accurately measuring gas flow. 

Its measurement value is not misaligned due to the fluctuation of temperature or 

pressure and does not require temperature and pressure compensation. 

The mass flow controller, Mass flow controller (abbreviated as MFC), 

not only has the function of mass Flowmeter, 

but also can automatically control the gas flow, 

that is, the user can set the flow rate according to the need. 

Even if the system pressure fluctuates or the ambient temperature changes, 

it will not deviate from the set value. 

In short, the mass flow controller is a stabilizing device, which can be manually set 

or automatically controlled by computer.