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 moving. Our customers are scientists, engineers, hydrologists, research associates, water resource planners, and anyone that needs to collect velocity, flow, or discharge data in every kind of body of water imaginable.