/industries/otherindustries/water-wastewater/b/weblog/posts/comparing-radar-and-ultrasonic-level-measurementUltrasonic level measurement uses sound to measure the level in a tank or vessel. It has been widely used in the water & wastewater industry for many years. A Water Online article, Level Measurement Showdown: Ultrasonic Vs. Radar  compares and contrastsen-USTelligent Community 13