This adjustable resistance box is designed for educational, making it a ideal tool for middle school physics experiments. It allows students to explore electrical concepts by providing a wide range of resistance . The device is user-friendly and helps in understanding the principles of electricity and resistance in a hands-on manner. Features -Color:Black -Material:Plastic Metal -Size:16.30X12.20X8.50cm/6.41X4.79X3.34in -Wide adjustment range: the resistance box offers a broad adjustable range from 0 to 99999.9 , catering to various experimental needs -Standard for students: specifically designed for middle school electrical physics experiments, meeting educational standards -precision: makes accuracy, making experimental results -adjustability: allows flexible adjustment of resistance according to experimental requirements -Design: built to withstand longterm use without easily getting Package list: 1 x Resistance Box