lpb1-2 acoustic wave instrument is used to measure wave height and wave period, and is suited for ocean stations, ports, ocean platforms and lakes. the instrument boots automatically controlled by clock, it realizes automatic and intelligent observation. the system measures wave using based on the sonar ranging principle. it contains underwater transducer, bracket, shore host, printer, computer, signal cables. the system is listed in national ocean bureau seashore observation criterion as a main measuring tool of wave observation.