Brand new and high quality Features: 1. Applicable 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. Can serve as excellent teaching and experimental equipment. 5. Ideal for adjusting current in need by entering a circuit as a known resistance. Specification: Material: Iron Type: Resistance Box Color: Black Available resistance: 0 ohm to 9999.9 ohm Size: 14 x 10 x 5 cm (5.51 x 3.94 x 1.97 in) Quantity: 1 pc Note: 1. Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Resistance Box