The solution provides projection information for supplies based on your usage. 

From any of the views pages you can select the Magnifying glass icon to see the supplies in the printer details

Then select a supply currently installed in the printer.

The presented window provides information on the supply including the projection for future usage.
In the top portion, you can see on the far right, what is left in the supply. This is all calculated and provides statistic based on your current usage of how much life is left in this cartridge. As well, if enough information is present, also the usage of the next cartridge under Next is predicted.

The graph in the middle also shows a timeline of usage for the previous cartridge, current cartridge with expected  end of life and then when the next cartridge could be used and how long it will last.

In the bottom of the page you can see the raw level readings for the supply with time stamps.