Metal pipe rote meters have the characteristics of simple structure, work reliable, wide range of temperature, high measure accuracy and cheap price. Serious products of this kind have a variety of local indication, electric remote transmission, anticorrosion, and explosion-proof. It is widely used to measure and control liquid and air automatically in lines of national defense, chemical, petroleum, metallurgy, electric power, environmental protection, medicine, and textile industry, etc. Meter transducer parts can adopt stainless steel(1Cr18Ni9Ti), OCr18Ni2Mo2Ti, inside fluoroplastic, also can adopt other material as your information to adapt to the flow measurement of corrosion fluid, e.g. chlorine water, salt water, hydrofluoric acid, nitric acid, sulphuric acid.When a flow of fluid goes through straight column hollow space, the taper floater with leader reaches to one place. When the power of buoyancy A acted to floater, damping force W and floater weight G reach to an equal state, the floater location can stand for flow of that time. Every height of floater can represent an instant value of flow. And then transmit to indicator by the couple action of magnetic steel in floater with the magnetic steel in indicator, to drive the pointer turnover, lobe plate works with pointer straightly indicate the flow value.