The EC-7VAR-RS is a three-phase voltage and current data logger that uses three flexible Rogowski coils and 4 Voltage leads (L1, L2, L3 and Neutral) to connect to your supply.  Setup the Logger using the Electrosoft software, then fit it to the distribution board or other point on the system that you want to measure. It measures and records 3 phase voltage, 3 phase current and PF (power factor) on L1/A1. Allowing you to record kW, kVAR, kVA, peak demand, highest/lowest currents, highest/lowest voltages, PF all with dates and times.
 
This logger is designed to be installed by a competent person (generally an electrician or engineer), and if isolated test points are available can be fitted without power interruption.  Once you're set up, just press the Start button to start logging!  The indicator will flash Green when recording.
 
When the logger's finished recording (or you've captured enough data!) just disconnect from supply, hook it up to your PC and download the information.  Electrosoft will let you view the data immediately on-screen and save or export for later analysis.