The Lascar Electronics EL-USB-4 data logger measures and stores up to 32,000 voltage readings over a 4-20mA D.C. measurement range. The user can easily setup the logging rate and start time, and download the stored data by plugging the module straight into their PC's USB port and running the EasyLog software that is compatible with Windows 98 through current generations. The data can then be graphed, printed and exported to other applications. This unit also features a long-lasting lithium battery that can last up to 3 years depending on usage patterns. Correct functioning of the unit is indicated by flashing red and green LED. The data logger features a pair of screw terminals and is supplied complete with a set of measurement leads terminating in crocodile clips.