The Sensit STH 102 temperature and humidity sensor is designed for measuring air temperature and relative humidity in indoor areas protected against water. It is suitable for use in offices, plant rooms, schools, residential buildings and other indoor spaces where reliable climate monitoring and data transmission via an RS485 bus using the Modbus RTU protocol are required. The device uses a shared internal sensing element to measure both temperature and relative humidity; the measured values are processed by a microprocessor and converted to a digital output. Thanks to its compact design, discreet appearance and high-quality plastic head, it is also suitable for interiors with higher aesthetic requirements. The sensor is intended for chemically non-aggressive environments and meets IP30 protection.