A passive oscilloscope probe is a high-impedance measurement tool designed for safely and accurately capturing electrical signals in industrial and laboratory environments. It features a fixed or switchable attenuation ratio (e.g., 10:1 or 100:1) to reduce signal distortion and protect oscilloscope inputs from high-voltage damage. Unlike active probes, passive probes require no external power, making them durable and cost-effective for general-purpose testing. Common applications include circuit debugging, power electronics analysis, and automotive diagnostics. Key variants include low-capacitance probes for high-frequency signals and high-voltage probes for industrial equipment monitoring.