The DLV-Pro Data Logging Voltmeter allows for fast & easy battery voltage testing with built in digital data-logging capabilities. The DLV-Pro automatically measures and records cell voltages in less than 1 second, enabling hundreds of cell voltage readings to be measured from a string of cells without having to write down a reading or push a button. The DLV-Pro increases testing efficiency by allowing the user to take hundreds of cell voltage readings from a string of battery cells without having to manually write the voltage or even push a button.