SonTek manufactures affordable, reliable Acoustic Doppler Current Profiling (ADCP) instrumentation for water velocity measurement in oceans, rivers, lakes, harbors, estuaries, and laboratories. Our instruments use sound waves to tell you how fast water is moving, where it is moving, and even if it is not. Our customers are scientists, engineers, hydrologists, research associates, water resource planners, and anyone needing to collect velocity, flow, or discharge data in every body of water imaginable.