The delivery comes with mounting brackets that can be easily installed on weather stations, street lights and other infrastructure. optical rain gauge series is a reliable and cost-effective choice for precipitation measurement. The overall size of the optical rain gauge is about the size of a tennis ball, and the internal sensor is completely sealed from the external environment. Working principle: When raindrops pass through the sampling space, the raindrops block the laser, and the light signal received by the receiving sensor and the electrical signal (such as voltage or current) converted from the light signal change. When the raindrop passes through the sampling space, it receive the electrical signal from the sensor. Restore the previous state. When the raindrops the sampling space, the electrical signals of the receiving sensor are processed, and the time for the raindrops to the sampling space can be obtained., Weight: 0.40565056208 Pounds, Manufacturer: Ehwisbe