Used for static electricity experiments. It can: measure the potential difference between two charged objects check whether an object is charged determine whether the object carries negative charge test the insulation of an object perform inductive electrification tests What you get and how it works Construction and key parts: metal shell, metal rod, and an electroscope ball for contact testing and charge transfer. Measuring potential difference between two charged bodies: Connect the metal shell to one charged body and the metal rod to the other charged body. Ground the shell as a general practice. If the earth potential is zero, the electroscope can be used to measure the potential of each charged body. Checking the charge of an object: Use the electroscope ball to touch the object under inspection. Transfer the obtained charge to the electroscope metal rod, or directly contact the object with the rod. Checking insulation of an object: Ground the object (for example, by touching it with your hand). Connect another point of the object to the charged electroscope metal rod. Observe the pointer. If it returns to zero quickly, the tested object is a conductor; otherwise it is an insulator. Use scenarios Physics classroom demonstrations to compare potentials and charges of different objects. Quick verification of charging or discharging between objects during experiments. Insulation evaluation of cables, insulators, or small components in a lab setting. Attributes Function: static electricity experiments, potential difference measurement, charge verification, insulation testing, inductive electrification testing Components: metal shell, metal rod, electroscope ball Material emphasis: metal components used for shell, rod, and contact elements Performance: designed for straightforward relation of grounding and contact methods to determine charge, potential, and insulation status This description preserves the original instrument's purpose, structure, and operating methods in clear, readerfriendly language.