0-9999 Ohm Simple Resistance Box Precision Variable Decade Resistor Teaching Instrument f54 Features: Can be part of the circuit Ohm's law. 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 physical electricity experiment teaching. Specification: Attenuation Range or Mini Step: 0 to 9999ohm, 1 ohm step Shell material: Plastic Dimensions: 14x10x5cm or 5.51x3.94x1.97inch Color: Black Quantity: 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 x 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.