Simple design: The resistance box is simple in structure, easy to use, and simple in design, allowing you to use it with confidence. Our variable resistance box is light and reliable, portable and practical, suitable for school use. Features Color: Black. Material: Plastic. Size: About 14.00X10.00X5.00cm/5.50X3.93X1.97in. Simple design: The resistance box is simple in structure, easy to use, and simple in design, allowing you to use it with confidence. Our variable resistance box is light and reliable, portable and practical, Suitable for school use. Sensitive and : the simple resistance box is as an additional resistance to expand the range of the voltmeter and give you a good experience. Simple and convenient to use: resistance box is very simple and convenient to use, very practical and experimental variable resistance box. Material: variable resistor plastic material, flexibility and excellent durability, easy to use and long service life. Professional application: resistance box electrical is to measure unknown resistance. to measure the electromotive and internal resistance of the power . Precise and practical. Package Including 1 x Variable Resistance Box