SW2 is a fully automatic hydrological online monitoring system based on microwave technology, which can simultaneously measure water level and rainfall in channels. It adopts advanced K-band planar radar technology to measure the water level and rainfall of water bodies in a non-contact manner. According to the built-in software algorithm, it calculates and outputs real-time cross-sectional flow and cumulative flow; Can be used for non-contact flow measurement in rivers, irrigation channels, underground drainage networks, flood prevention warnings, and other occasions; This product has the characteristics of low power consumption, compact size, high reliability, and easy maintenance; The measurement process is not affected by factors such as temperature, sediment, river pollutants, and floating debris on the water surface.