Precision variable decade resistor box 0-9999 Ohm for teaching instruments Features:<br> Can be verified part of the circuit Ohm's law.<br> Used as an additional resistor to expand the range of volts.<br> Used to measure unknown resistance.<br> Used as electromotive force and internal resistance for measuring power supply.<br> Used as a known resistor in the circuit to regulate the required current.<br> Used for physical electricity experiment teaching.<br> Specification:<br> Attenuation Range / Mini Step: 0 to 9999ohm, 1 ohm step<br> Shell material: Plastic<br> Dimensions: 14x10x5cm/5.51x3.94x1.97inch<br> Color: Black<br> Quantity: 1 Pc<br> Display Type: Analogue and Digital<br> Accuracy Class: as details<br> Operating Temperature: as details<br> DIY Supplies: Electrical<br> Testing Voltage: as details<br> 100% brand new and high quality<br> material: plastic<br> Package includes:<br> 1 * Simple Resistance Box<br> Only the above package content, other products are not included.<br> Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.