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Diagnostic Relay Buddy 12/24 Pro Test Kit ESI193 Wheel Sockets and Socket Sets Patented one-piece design and heatDiagnostic Relay Buddy 12 24 Pro Test Kit Features and Benefits Tests both 12 and 24 Volt relays 4 and 5 pin Diagnostic trouble codes indicate the cause of failure 3 different codes Pro test kit includes 5 new test adapters for shielded and new relay types Cycles relay 10 times: Green Light if relay is good, red light if relay is bad plus one of 3 diagnostic codes Tester uses 12V or 24V power from the vehicle battery Relay Buddy 12 24 is a quick go no