Lascar EL-USB-2+ High Accuracy Humidity, Temperature and Dew Point USB Logger - Lascar EL-USB-2+ CAL-T/H, This standalone data logger measures and stores up to 16,382 relative humidity and 16,382 temperature readings over 0 to 100% RH and -35°C to +80°C (-31°F to +176°F) measurement ranges. The user can easily set up the logger and view downloaded data by plugging the data logger into a PC's USB port and running the purpose designed software under 32-bit and 64-bit versions of Windows 7, 8 and 10. Relative humidity, temperature and dew point (the temperature at which water vapour present in the air begins to condense) data can then be graphed, printed and exported to other applications. The data logger is supplied complete with a long-life lithium battery, which can typically allow logging for 3 years. For further details see the FAQ here. Lascar EL-USB-2+ High Accuracy Rel. Humidity and Temperature Data Logger CAL-T/H