Extech voltage and current data logger extech dl160 the extech dl160 voltage and current data logger logs up to 256 000 true rms current and voltage readings the logger will monitor two different inputs simultaneously for example one voltage and one current or two voltages captured readings can be downloaded to your pc for further analysis using the included usb cable and software readings can also be exported into a spreadsheet for creating charts and graphs supplied with 2 x current s