* The presence of a charge: If an electroscope's leaves are separated, it means there's a charge present on the electroscope.

* The type of charge: If a charged object is brought near an electroscope, the leaves will either diverge further (if the object has the same charge) or converge (if the object has the opposite charge).

* The relative strength of a charge: The wider the separation of the leaves, the stronger the charge.

* The rate of charge leakage: By observing the speed at which the leaves collapse, you can determine the rate at which charge is leaking from the electroscope.

However, an electroscope cannot determine:

* The exact amount of charge: It only indicates the presence and relative strength of a charge.

* The polarity of a charge: It can tell you if two objects have the same or opposite charges, but not the specific positive or negative nature of the charge.

In summary, an electroscope is a simple device that provides qualitative information about electric charges, but it's not a precise measurement tool.