The outdoor air temperature sensor is designed for accurate and reliable measurement of ambient temperature in external conditions, ensuring precise data even in the presence of direct solar radiation and atmospheric agents. It uses a high-precision platinum resistance thermometer (Pt100), compliant with international standards, and is protected by a multi-shield solar radiation screen system that prevents direct irradiation and ensures continuous natural ventilation. The specific configuration of the radiation shields, made with reflective surfaces, reduces heating effects induced by solar radiation, ensuring measurements that represent the true air temperature. Thanks to its robust construction and compliance with WMO (World Meteorological Organization) standards, the sensor represents an ideal solution for meteorological, environmental, and geotechnical applications.