This datalogger measures and stores up to 16,379 relative humidity and 16,379 temperature readings over 0 to 100% RH and -35 to +80°C (-31 to +176°F) measurement ranges. The logger can be simply plugged into a USB port to download the data. Data can then be graphed, printed and exported to other applications. The unit has a high contract LCD and the button allows the operator to cycle through, the current temperature and humidity readings, as well as the max and min of both. The internal battery is a replaceable long-life lithium battery which will last for at least 1 year.