A rugged USB data logger that continuously records both temperature and relative humidity, with a built-in LCD so current readings can be checked on the spot without a computer. It plugs straight into any USB port to download its log history and can auto-generate a report, with adjustable recording intervals, thousands of stored readings, and programmable high/low alarms backed by LED and buzzer warnings. Built for monitoring temperature- and humidity-sensitive goods in transit or storage, such as cold-chain shipments or warehoused stock.