Features: 1. It can be applied to electrical experiments for middle school, technical high school and other suitable situations. 2. Suitable for verifying parts of Ohm's law. 3. Can be used to measure unknown resistance. 4. It can serve as a great teaching and exprimental team. 5. Ideal for adjusting the current you need in the way to enter a circuit as known resistor. Specifications: Material: iron. Type: Resistance Box Colour: black. Obtainable resistance: 0 ohm at 9999.9 ohms. Size: 14 x 10 x 5 cm. Quantity: 1