This is a sensor that can be applied for Far Infra Red (FIR) radiation observations. The main application is in meteorological outdoor experiments. The scientific name of this instrument is pyrgeometer. This is heated, which improves measurement accuracy because it prevents dew deposition. This has a special housing, which makes it possible to include a transmitter, or amplifier. For additional information on the application, use and specifications of regular pyrgeometer, brochure and manual can be consulted.