Multi-Functional Automotive Circuit Tester This reliable tester kit offers a wide range of diagnostic capabilities to support automotive electrical work. It supports component flexibility, voltage detection, diode detection, continuity testing, ground detection, short circuit tracing, positive and negative detection, overload protection, built in lighting, and audible indicators for convenient troubleshooting. High Definition LCD Display The tester provides a high definition LCD display for precise voltage readings. A red LED paired with a blue LCD voltage readout indicates positive polarity or positive activation, while a green LED paired with a blue LCD readout indicates negative polarity or reverse activation. Convenient Maintenance Lighting Designed with an integrated lighting feature, the tester provides extra illumination for maintenance and diagnostics in low light or nighttime conditions. Key benefits and why you need it - Comprehensive electrical diagnostics in one tool: voltage, diode, continuity, ground, and short circuit tracing with protection features all in a single device. - Clear polarity and status indicators: red and green LEDs with blue LCD readouts help you quickly confirm circuit conditions. - Reliable protection: overload protection helps prevent damage to the tester and the circuit under test. - Built in lighting and audible feedback: supports hands free work at night and confirms results without constant monitoring. Typical use scenarios - Battery and charging system checks: verify voltage levels, polarity, and detect potential short or open circuits in charging circuits. - Wiring and harness troubleshooting: locate ground faults, check continuity, and follow circuit paths to identify breaks or shorts. - Aftermarket installation work: test new sensors or accessories, confirm diode orientation, and ensure correct positive/negative connections with audible alerts. Performance and compatibility Designed for automotive electrical systems, the tester supports common diagnostic tasks with clear visual and audible feedback. It combines multiple functions into a single, portable kit to streamline maintenance and repair workflows.