A humidity data logger is a compact electronic device designed to monitor and record humidity and often temperature levels over time. It is widely used in industries such as pharmaceuticals, agriculture, food storage, HVAC, and laboratories where environmental conditions must be precisely controlled and documented. These loggers typically feature sensors that measure relative humidity and store data at set intervals, which can later be analyzed via USB or wireless connectivity. Some advanced models include LCD screens, alarms, and mobile app support for real-time tracking. In Bangladesh, humidity data loggers are essential for businesses that need to meet regulatory and quality standards. Prices vary based on features and accuracy, with affordable options for basic monitoring and higher-end models for critical environments. Their ease of use, reliability, and portability make humidity data loggers an ideal choice for consistent climate monitoring and data analysis.