GD-300 is a non-contact flat weight gauge for surface water level measurement. It uses frequency modulation continuous wave radar (FMCW) technology to measure the liquid level. This makes the RD-300 unaffected by temperature gradients, water vapor, water pollutants, and sediment during measurement. The optimized algorithm can make the measurement results more accurate. Compared with the traditional pulse horn type water level gauge, it has the characteristics of small size, convenient installation and small maintenance.