ITEM NAME:Black Resistance Box Iron Variable Decade Resistor Resistance Box 0-9999.9 I9U6 Black Resistance Box Iron Variable Decade Resistor Resistance Box 0-9999.9 I9U6 Variable decade resistance box. Fine workmanship and good performance. Durable in use Great teaching help and test equipment. Suitable for teaching physical transmission experiences. Possible resistance: 0 ohm to 9999.9 ohm Material: plastic Color: Black Size: Length: about 170cm Package Contents: 1 x resistance box