1. This instrument is used for experiments with static electricity. It can measure the potential difference between two charged objects; check if the object is charged; determine if the object is negatively charged; assess the insulation of the object; and conduct tests for inductive electrification. 2. When measuring the potential difference between two charged bodies, connect the metal shell of the electroscope to one charged body and the metal rod to the other charged body, while generally grounding the shell. When the Earth's electrical potential is zero, the electrical potential of each charged body can be measured using the electroscope. 3. When checking the charge of an object, the electroscope ball can first be brought into contact with the object under examination, and the received charge can then be transferred to the metal rod of the electroscope. Alternatively, the metal rod can be directly touched to the object. 4. The simplest method to check the insulation of an object is to ground the object (e.g., by touching it with your hands) and then bring another part of the object into contact with the charged metal rod of the electroscope. Observe the electroscope's pointer. If the pointer quickly returns to zero, the tested object is a conductor; otherwise, it is an insulator.