EM285 automotive circuit tester offers versatile, practical diagnostics for modern vehicle electrical systems. It covers continuity checks for switches, relays, diodes, fuses, and circuits, and it tests for poor grounds, cable and plug polarity, continuity, and voltage polarity. It also efficiently tracks and locates short circuits. LED indicator system Red and green LEDs provide clear, immediate visual feedback, helping you confirm results at a glance during testing. Polarity testing Allows precise polarity verification for cables and plugs, ensuring correct wiring and helping prevent malfunctions or damage to the vehicle’s electrical system. Overload protection Equipped with 8A overload protection to guard against excessive current, increasing safety and reliability during testing procedures. 2-3 practical use scenarios - Diagnose a non-working circuit by checking fuse, relay, and wire continuity and polarity to identify the fault path. - Verify ground integrity and wiring polarity when installing a new sensor or harness to prevent incorrect connections. - Locate a short by tracing continuity and polarity across suspected harness sections while isolating circuits to pinpoint the fault area. This tool is designed for clear, professional, and trustworthy performance, delivering essential function and safety features without unnecessary complexity.