A temperature and humidity sensor is a precision device designed to monitor and measure environmental conditions in real time. It detects ambient temperature and relative humidity with high accuracy, making it widely used in HVAC systems, smart homes, agriculture, warehouses, laboratories, and industrial automation. By continuously collecting data, it helps users maintain optimal comfort levels, protect sensitive equipment, and ensure product quality during storage and production. Modern sensors often feature digital output, low power consumption, fast response time, and strong anti-interference capability. Some models support wireless transmission and integration with IoT systems, enabling remote monitoring through mobile apps or cloud platforms. With stable performance and compact design, temperature and humidity sensors play a critical role in environmental control and intelligent management systems.