Features: Can be a part of the circuit's Ohm's law. Used as an additional resistor to extend the voltage range. Used to measure unknown resistance. Used as electromotive force and internal resistance to measure power supply. Used as a known resistance in the circuit to regulate the required current. Used for teaching physical electricity experiments. Specification: Attenuation range / mini step: 0 to 9999 ohm, 1 ohm step Shell material: Plastic Dimensions: 14x10x5cm/5.51x3.94x1.97 inches Color: Black Quantity: 1 pc Display type: Analog and digital Accuracy class: according to details Operating temperature: according to details : Electrical Test voltage: according to details and high quality material: plastic The 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 to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.