This instrument is used for electrostatic experiments, it can test whether the object is charged, the object with the power is positive or negative, the insulation of the object and demonstration induction charge. Features - Color: Random color. - Size: 7.00X5.50X3.00cm/2.75X2.16X1.18 inch. - Material: Plastic. - Our foil electroscope has a nice appearance, simple structure, which is simple and convenient to operate. - The foil electroscope can check whether the object is charged and how much it is charged, which is a very commonly used experimental equipment. - Made of high-quality material, this foil electroscope is durable and long term use. - These lightweight physics experiment equipment are perfect for physics demos and projects in school. - Fine workmanship and creative appearance ensure its popularity and practicality.