The Lascar EL-USB-RT Real-time USB Temperature & Humidity Monitor measures  temperature and relative humidity from -10 to +60°C (+14 to +140°F) and 0 to 100%RH, when plugged into the USB port of a PC installed with the purpose designed software underWindows 2000, XP and Vista.

The PC displays the temperature, humidity and dew point(the temperature at which water vapor present in the air begins to condense) in real-time and saves it to a file which can store up to 7 day's worth of data. This data file is overwritten at the beginning of each new logging session.

The software provides the option for the user to save the data file permanently to the hard-drive. Temperature, relative humidity and dew point can be graphed, printed and
exported to other applications.