NCAS Humidity And Temperature PROfiler (HATPRO) Scanning Microwave Radiometer unit 1, by Radiometer Physics GmbH. is used to derive vertical profiles of atmospheric temperature and humidity. The infrared radiometer extension allows to cloud base height and ice cloud detection.The radiometer offers high-resolution temperature profiling of the boundary layer and low-humidity applications. The radiometer provides accurate total amounts of atmospheric water vapor and cloud liquid content measurements.