PYR20 pyranometer, or solar Radiation Sensor, measures global radiation of both direct and diffusion of solar irradiance. The internal temperature compensation minimizing the error caused by heating of the sensor. Each sensor is calibrated against Eppley Pyranometer and offers excellent accuracy and consistency. The sensor is applicable for science research, solar power , greenhouse, weather station etc. Temperature compensated Output interface with RS485, Voltage or Current Measurement range to 2000W/m2, range 400-1100nm Level indicator and spring loaded for installation, Weight: 0.52359787225 Pounds, Manufacturer: Prterver