Features: Can be used to verify part of the circuit Ohm's law. Functions as an additional resistor to extend voltage range. Used for measuring unknown resistance. Serves as a known resistor in circuits to regulate current. Applicable for electromotive force and internal resistance measurement of power supply. Ideal for physical 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 inch Color: Black Quantity: 1 Piece Display Type: Analog and Digital Accuracy Class: As specified Operating Temperature: As specified Testing Voltage: As specified DIY Supplies: Electrical Material: Plastic Package Includes: 1 x Simple Resistance Box Note: Light and display differences may cause slight color variation between the image and actual item. Measurement error allowance is +/- 1-3 cm.