4 line character LCD display the flow rate, flow speed, calculation flow, signal Inner data memory, can record date, flow, working time. RS-232 output OCT output, surge signal, frequency signal 1~9999Hz. Water, seawater, sewage, PH liquid, oils and other liquids. Capable of ultrasonic wave propagation. Inner Ni-H battery can work 20 hours. Flow rate0~30m/s Accuracy 1%