Not much bigger than a memory stick, the Aercus Instruments USB Temperature and Humidity Data Logger is a very easy to use datalogger for recording air temperature and humidity. Simply place the logger in the area you want monitored and push the start button. The data can then be downloaded to your PC for viewing and graphing (software included). The logger has a built in USB connection on its tip so it plugs straight into your PC. The logger stores up to 16,000 readings with a user selectable measurement interval from 2 seconds to 24 hours.