Features: Can be used in circuits to demonstrate Ohm's law. Serves as an additional resistor to extend voltage measurement range. Useful for measuring unknown resistance values. Can be used to determine electromotive force and internal resistance of power supplies. Functions as a known resistor in circuits to regulate current. Ideal for physics electricity experiment teaching. Specifications: Attenuation Range / Minimum Step: 0 to 9999 ohm, 1 ohm step Shell Material: Plastic Dimensions: 14 x 10 x 5 cm (5.51 x 3.94 x 1.97 inches) Color: Black Quantity: 1 Piece Display Type: Analog and Digital Accuracy Class: As specified Operating Temperature: As specified Electrical Testing Voltage: As specified High-quality plastic construction. Package Includes: 1 x Simple Resistance Box Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.