It measures Voltage and 3 current circuits.
The data on screen and in the database is realtime per second resolution.
The idea being that even from 1 monitoring point you can tell various appliances from there "fingerprint"
What works well is to first monitor the main feed and then based on the results put extra CT's on feeds to major candidates.
This is especially true once you have identified culprits and are looking to replace or make changes to improve efficiency.
For instance, a geyser would be an obvious choice but until you have detailed stats, you can't know if replacing it with a heat pump can be justified.
You would also be guessing how quickly such a device would pay off.
But once you have the data, you can make an informed decision.
The unit is also designed to measure bi directionally so if you 1 day buy your own solar system, it can measure what you generate and export/store etc.