The optical rainfall sensor uses the principle of optical induction to measure rainfall. A number of optical probes are built in and reliable telemetry algorithms are used to ensure reliable rainfall detection. Different from the traditional mechanical sensor, optical rainfall is smaller, more sensitive, more reliable, more intelligent, and easy to maintain.

The portable digital signal collector is a multi-interface data acquisition instrument which is developed by Huachang Science and Technology and integrates data acquisition, storage, analysis and customization. With the humanized interface and the operation interface, operation is simple and reliable. It has built-in mass memory, which can store more than 60000 pieces of data.