Low Cost Ultrasonic Flow Meter Can Be Equipped with An Optional Lcd Display /key Board Module. the Users Can Either Users Can Either Use the Rs-485 Interface or the Display /keyboard Interface to Program the Flow Meter.the Transducer Installation is also Simple and No Special Skills or Tools are Required. due to the Non-intrusive Nature of the Clamp-on Technology, There is No Pressure Drop, No Moving Parts, No Leaks, No Risk of Contamination, No Risk of Corrosion, No Pressure Dependency.