A humidity logger, also known as a humidity data logger, is a device used to continuously monitor and record humidity levels in an environment over a specified period. It is a type of data logging instrument that provides valuable information about humidity variations, trends, and conditions in various settings. Applications for humidity loggers are diverse and include monitoring environmental conditions in industries such as pharmaceuticals, agriculture, food storage, HVAC system performance, cleanrooms, and museums. They are valuable tools for ensuring product quality, safety, and regulatory compliance by providing a detailed record of humidity conditions over time.