Seeed Studio Industrial Photosynthetically Active Radiation (PAR) Sensor is designed to measure real-time photosynthetically active radiation across the radiation range from 400nm to 700nm. This sensor contains a silicon photodetector and generates a voltage signal that is directly proportional to the PAR under the light source. The PAR sensor supports the MODBUS-RTU RS485 protocol and can be directly connected with RS485 data loggers or digital voltmeters to create monitoring systems. This sensor comes in an IP66 rated enclosure and is able to withstand a wide range of temperature from -30°C to 75°C. The PAR sensor is ideal for use in environmental monitoring, agricultural research, solar energy research, optical research, and other sensor applications.