The electroscope is an instrument used to detect the presence of charge.
Electroscope is used to measure charge quantitatively.
It can only give rough indication of the quantity of charge.
Working procedure of electroscope
The principle of an electroscope is based on the atomic structure of the elements, charge induction, the internal structure of metal elements and the idea that like charge repels each other while unlike charge attracts each other.
Types of electroscope
Pith Ball electroscope
Gold Leaf electroscope