... :12.6VDC 350mA Single Output:RS485 Digital Ultrasonic Water Depth Meter 1: Profiles:HLU-SF ultrasonic probe to measure water depth ... low maintenance, high reliability, long life, easy to use, simple operation, accurate measurement characteristics.It is widely used hydrographic surveying, hydropower ... 50/60HzOutput voltage: 12.6VDC 350mA Digital Ultrasonic Water Depth Meter