0-9999 Ohm Simple Resistance Box Precision Variable Decade Resistor Teaching Instrument f54 Features: Can be part of the circuit Ohm's . Used as an additional resistor to expand the range of volts. Used to measure unknown resistance. Used as electromotive force and internal resistance for measuring power supply. Used as a known resistor in the circuit to regulate the required current. Used for electricity experiment teaching. Specification: Attenuation Range / Mini Step: 0 to 9999ohm, 1 ohm step Shell material: Plastic Dimensions: 14x10x5cm/5.51x3.94x1.97inch Color: Black : 1 Pc Display Type: Analogue and Digital Accuracy Class: as details Operating Temperature: as details : Electrical Testing Voltage: as details and high quality material: plastic Package includes: 1 * Simple Resistance Box Only the above package content, other products are not included. Note: Light 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.