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 10 hours Flow rate0~30m/s Accuracy 1% Size201*92*42mm Weight538g