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Fast Relay Diagnostic: This relay tester quickly checks automotive relays and shows their working status, helping you identify faulty relays without guesswork. Accurate Contact Testing: Connect to a continuous 11V-15V car battery and the tester checks relay contact function, closing time and relay inertia at each test phase. Clear LED Results: A green light means the relay passed the test, a red light means it failed, giving you an instant visual result for relay condition. 12V Battery Requirement: Works with a 12V car battery, voltage between 11-15V, and a relay coil resistance of around 20 ohms for correct testing. Portable Compact Design: Small and compact structure makes this relay tester convenient to carry and use anywhere you need a quick, economical diagnosis.