Description Simple in structure, easy to use, simple appearance design, you can use it with confidence. Our variable resistance box is lightweight and reliable, portable and practical, suitable for school use. Features -Color: Black. -Material: Plastic. -Size: About 14.00X10.00X5.00cm/5.50X3.93X1.97in. - Very easy and convenient to use, it is very useful and experiment variable resistance box. - and . The simple resistance box is used as an additional resistance to expand the range of the voltmeter. - Plastic material, flexibility and excellent durability, easy to use, for long service life. - It is used to measure the unknown resistance. It is used to measure the force and internal resistance of the power supply. - Simple in structure, easy to use, simple appearance design, you can use it with confidence. Very easy and convenient to use, it is very useful and experiment variable resistance box. and . The simple resistance box is used as an additional resistance to expand the range of the voltmeter. Plastic material, flexibility and excellent durability, easy to use, for long service life. It is used to measure the unknown resistance. It is used to measure the force and internal resistance of the power supply. Simple in structure, easy to use, simple appearance design, you can use it with confidence.